Are Traditional Agencies Falling Behind on TikTok? A UK Perspective

TikTok has revolutionized the UK digital marketing landscape. With more than 23 million active UK users (Statista, 2025), the app has matured from a Gen Z dance craze platform to one of the most powerful business growth drivers on the market today. For fashion, tech, finance, and eCommerce businesses, TikTok is now a platform where awareness, engagement, and conversion take place at breakneck speeds.
But the fact is, old-school ad agencies are behind the times. The same ad agencies that were so good at TV campaigns, Facebook ads, and Instagram influencer marketing are now increasingly out of touch with the particular requirements of TikTok. That is why UK businesses have asked a simple question:
Is my current TikTok agency really working, or am I stuck in a model that is not meant to thrive on this platform?
It is here that we will analyze why the conventional agencies fail on TikTok, why new TikTok Agencies are built to be different, and what precisely you can anticipate from high-performing TikTok ads services in 2025.

What the Traditional Agencies Struggle With

1. Slow Content Generation

Traditional agencies are based on long lead times. Conceptual ideas are presented, worked up, tested, and finally delivered — sometimes weeks, even months, apart. That is old-school on TikTok.
TikTok trends have an extremely fleeting lifespan and exist for days at best, hours at least. A filter, meme, or soundbite may blow up and go viral, but by the time a mainstream agency greenlights creative, that train has left the station. UK brands collaborating with such agencies are perpetually two steps behind the competition that can ride trends in real time.
Example: One of the most viral sounds in March 2025 generated over 1.4 million videos created within a week. Brands that were early adopters saw organic reach boost by 200–300%. Agencies who missed the window? Their posts trailed weeks behind and didn't gain much traction.

2. Shortage of Native TikTok Knowledge

TikTok is not Instagram. It's not YouTube. It is a different world, based on comedy, reality, and storytelling under 30 seconds.
Traditional agencies just repackage old video commercials for TikTok, cropping or shortening them. That's not doing the platform justice. The audience for TikTok will quickly dismiss anything too slick, too scripted, or "like an ad."
One of the UK high street giants teamed up with an agency of heritage who produced shiny, cinematic ads replicated from the TV commercials. The production-rich commercials underperformed with CTR 70% lower than average since TikTok users were not engaging with them.

3. Disregarding Creator Culture

TikTok exists and thrives off its creator economy. Creators, micro-creators, and community niche leaders drive trends, discuss things, and ultimately make purchase decisions.
Traditional agencies fail to notice creator collaborations, though, and turn to the old paid advertising instead. This makes brands invisible in the organic, creator-driven conversations that power the TikTok force.
UK food delivery companies that partnered with TikTok influencers saw new registrations grow by 25% compared to rivals that relied only on paid-for advertising. Creator partnerships are not a nicety, but a necessity.

How Modern TikTok Agencies Differ

New TikTok Agencies have stepped in to deliver UK brands something that the incumbent players cannot: platform-native expertise and fluency, and most importantly, speed.

1. Agile Trend-Led Strategies

Professional TikTok agencies track the site every day for upcoming trends — sounds, hashtags, challenges, and editing trends. They are prepared with teams to produce and release content within 24–48 hours so the brands remain current.
This agility means UK brands can ride the wave of viral content, staying visible where audiences are paying attention.

2. Real-Time Testing

Rather than waiting weeks to have things optimized, TikTok agencies test content quickly. They test multiple creatives at once, measuring performance metrics such as engagement rate, watch time, and ROAS (Return on Ad Spend) in real time.
This quick test technique helps brands to scale winners and drop losers early to prevent wasting budget.

3. Creator-Centric Campaigns

A modern TikTok Agency builds entire campaigns out of user-created content (UGC) and influencers. They don't "buy reach." They put brands inside the culture of TikTok by working with content creators who know how to create conversation.
For example: A UK beauty brand partnered with a specialist TikTok agency and leveraged creator partnerships to run a TikTok Shop campaign. They were able to achieve:

• 3.2x higher ROAS than ordinary brand ads
• A 42% cost per acquisition (CPA) reduction
• More than 12,000 units sold in 6 weeks

What to Expect from Good TikTok Ads Services

New TikTok advertising services are not just media buys. They are end-to-end solutions that are platform-specific.

Spark Ads

Spark Ads allows brands to scale influencer or organic content to make it appear and feel like a native TikTok. It introduces paid reach to the authenticity.
UK brands that have used Spark Ads have seen 140% higher-than-average engagement compared to standard in-feed ads.

Influencer Whitelisting

Agencies now buy the ads directly from creator accounts and not brand accounts. This is a trust-building tactic because the content looks creator-driven and not corporate.

Performance Testing & Reporting

Excellent TikTok agencies offer real-time dashboards and weekly reports with commentary about what's working and why. The following metrics should be monitored:

• Engagement rate
• View-through rate
• Conversion rate
• Cost per purchase

This openness allows brands to make informed decisions rather than making assumptions.

Case Study: UK Fashion Retailer vs. Traditional Agency

One UK high-street chain first partnered with an established agency to launch TikTok ads. Their first campaign (cinematic ads reworked from Instagram) didn't quite cut it:

• CTR: 0.35% (lower than TikTok benchmark of 1–2%)
• ROAS: 0.9x (campaign was not profitable)
• CPA: £27 (unaffordable)

They moved to a contemporary TikTok agency that deals in TikTok ads services. The new campaign consisted of:

• Creator-generated content filmed on iPhones
• Spark Ads powering organic posts
• Fast creative testing (20+ versions within 2 weeks)

The findings:

• CTR: 1.9% (5x higher)
• ROAS: 3.7x
• CPA: £8.50 (70% off)
• Sales: over 22,000 units per month

This is why the old agencies are unable to compete in the TikTok arena.

Conclusion

TikTok is now the UK's top-performing social commerce driver — but only for some brands that understand how to leverage it. Stodgy old agencies with their stately timelines and tired playbooks just aren't built to succeed here.
Today's TikTok agencies that have a special TikTok ads service are the solution. They provide:

• Agility and speed
• Creator-first campaigns
• ROI-based ad campaigns

For UK businesses in 2025, it is as simple as this: stick with an outdated agency and fall behind, or choose a new-age TikTok Agency and thrive.
Want to work with a committed TikTok Agency that specializes in the UK market?
The Short Media offers creator-centric, data-backed TikTok ad solutions meant to maximize growth.