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Case Studies

How UK E-commerce Brand Reduced CPA by 45% with Strategic PPC Overhaul

45% CPA reduction, 2.3x revenue growth

Overview

UK E-commerce Brand Slashes CPA by 45% While Scaling Revenue 2.3x

A complete PPC overhaul turned a struggling account into a profitable growth engine.

Google AdsE-commerceUK Market

Scope

The Client

A mid-sized UK e-commerce brand selling home and garden products online. Operating in a competitive market with multiple well-established competitors.

Common Gaps

The Challenge

Rising costs per click making existing campaigns unprofitable

No clear view on which products or keywords actually drove profit

Previous agency focused on vanity metrics (clicks, impressions) not business outcomes

Shopping campaigns hemorrhaging budget on low-intent queries

Brand campaigns cannibalising organic traffic without adding value

Mobile traffic converting at half the rate of desktop (but no mobile-specific strategy)

Execution Flow

What We Did

  1. 1

    1. **Full Account Audit**: Identified £6,000/month wasted on non-converting keywords and negative keyword gaps

  2. 2

    2. **Tracking Overhaul**: Implemented server-side tracking, enhanced conversions, and revenue-based conversion values

  3. 3

    3. **Campaign Restructure**: Built new campaign structure based on product margins and customer lifetime value

  4. 4

    4. **Shopping Campaign Optimization**: Fixed feed issues, implemented priority campaigns, added negative keywords

  5. 5

    5. **Mobile-Specific Strategy**: Separate mobile campaigns with adjusted bids and mobile-optimised ad copy

  6. 6

    6. **Testing Programme**: Continuous A/B testing of ad creative, landing pages, and bidding strategies

Impact Focus

Results in 6 Months

Cost Per Acquisition

-45%

Monthly Revenue

+131%

Return on Ad Spend

3.2x to 5.8x

Scope

The Breakdown

Beyond headline numbers, here's what actually changed in the account:

Next Step

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Detailed Timeline

Month 1: Foundation

Month 2: Optimisation

Month 3: Breakthrough

Months 4-6: Scale

Key Learnings

  1. Most accounts have significant hidden waste. This client was spending £6,000 monthly on keywords that had never converted. Basic negative keyword management solved this immediately.

  2. Tracking quality determines optimisation quality. Without proper revenue tracking and attribution, we were flying blind. Server-side implementation and enhanced conversions were game-changers.

  3. Mobile requires separate strategy. Treating mobile the same as desktop was costing conversions. Device-specific campaigns with tailored creative and bids unlocked significant value.

  4. **Shopping feeds are often under-optimised. ** Basic feed improvements (titles, attributes, GTINs) had outsized impact on Shopping campaign performance.

  5. Profitability matters more than CPA. Some products had higher CPA but better LTV. Shifting focus from CPA to contribution margin allowed us to optimise for business outcomes, not arbitrary metrics.

Technical Implementation

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Tracking Stack

Campaign Architecture

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This case study represents what’s possible with proper strategy, execution, and optimisation. Your business is unique, but the principles apply.

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