If you are shopping UK whey concentrate on a budget, two names keep coming up: MyProtein Impact Whey and The Protein Works Whey 80 (BLACK). Both are direct-to-consumer budget whey concentrates, both run near-constant discount codes, both ship from UK warehouses, and both have huge customer bases.
Here is how they actually compare on WheyWise data pulled today.
Price per 100g
MyProtein Impact Whey has been cheaper per 100g on average over the last 14 days. Its price floor during Q2 sales is around £2.42/100g, with 1kg bags starting from £22.99. TPW Whey 80 floors at roughly £2.61/100g, with 1kg bags from £17.89. Both have gone broadly sideways quarter-on-quarter — MyProtein Impact Whey concentrate is actually down 11.5% vs Q1 averages per our Q2 2026 Price Index, while TPW is up a mild 3.5%.
On the bag-price angle TPW looks cheaper (£17.89 for 1kg vs £22.99 for MyProtein's 1kg). But per 100g of actual protein — which is what matters — MyProtein has the edge right now.
Protein content
This is where TPW pulls ahead on the spec sheet. Whey 80 BLACK carries 74g of protein per 100g, against MyProtein Impact Whey's 72g per 100g. Both are honest labels, both batch-tested, both without wild filler claims. The 2g difference is small in practice but it is TPW's way of signalling "we spend a bit more on concentrate purity". Fat and carbs track almost identically (5.4g fat / 8.6g carbs for TPW vs 5.9g / 8.9g for MyProtein).
Flavours and sizes
MyProtein dominates range. Impact Whey has 48 distinct flavours currently listed across flavour reformulations and seasonal specials, with bag sizes from 345g all the way up to 5kg for serious bulk buyers. If you value choice or you want to share a 5kg bag across a gym-household, this is a real advantage.
TPW Whey 80 is narrower: five flavours, four bag sizes (500g, 1kg, 2kg, 4kg). TPW users tend to point to taste consistency and cleaner sweeteners as the trade-off — fewer SKUs to manage, fewer reformulations, less inventory churn. On taste WheyWise rates both at 70/100, so the rating is a wash.
MyProtein Impact Whey Protein Powder
810g bag
UK's bestselling whey concentrate with 82g protein per 100g. Regularly discounted 40-60% — never pay full price.
See cheapest price →Buy direct from Myprotein →MyProtein Impact Whey Protein Powder
810g bag
UK's bestselling whey concentrate with 82g protein per 100g. Regularly discounted 40-60% — never pay full price.
See cheapest price →Buy direct from Myprotein →Quick verdict
Pros
- + 82g protein per 100g high purity
- + Cheapest per serving during sales
- + Huge 60+ flavour range
- + 5kg bags for long-term savings
Cons
- – Full price is poor value
- – Needs discount code to compete
- – Reformulations change taste occasionally
Quick verdict
Pros
- + 82g protein per 100g high purity
- + Cheapest per serving during sales
- + Huge 60+ flavour range
- + 5kg bags for long-term savings
Cons
- – Full price is poor value
- – Needs discount code to compete
- – Reformulations change taste occasionally
The Protein Works Whey Protein 80 - BLACK Innovation
2kg bag
Solid whey concentrate from The Protein Works. Compare prices across UK retailers.
See cheapest price →The Protein Works Whey Protein 80 - BLACK Innovation
2kg bag
Solid whey concentrate from The Protein Works. Compare prices across UK retailers.
See cheapest price →Quick verdict
Pros
- + Frequently on sale great deals
- + 80% protein purity decent
- + Massive 40+ flavour menu
- + Smooth mixability with water
Cons
- – Full price is above average
- – Sweetness overpowering some flavours
- – Taste can vary between batches
Quick verdict
Pros
- + Frequently on sale great deals
- + 80% protein purity decent
- + Massive 40+ flavour menu
- + Smooth mixability with water
Cons
- – Full price is above average
- – Sweetness overpowering some flavours
- – Taste can vary between batches
Discount codes
Both brands are discount-code-heavy. The listed RRP on either site is essentially fictional — nobody pays full price. What matters is the floor price, which is what WheyWise tracks.
- MyProtein: near-constant stacked codes plus 2-3 headline sales per quarter. Codes are easy to find but the stated "sale" percentage is usually off an inflated RRP.
- TPW: fewer but deeper codes (50-60% off RRP on headline sales), combined with a more honest everyday price. TPW runs fewer permanent discount events but the ones they run tend to stack with free shaker or sample offers.
WheyWise tracks active codes for both on the deals page, so you do not need to hunt for them.
Which should you buy?
Honestly, check both before you buy and let the price decide. MyProtein is the clear pick if you want the widest flavour range, 5kg bulk bags, or you are chasing the lowest cost per gram of protein during a headline sale. TPW is the pick if you value higher protein density per 100g (74g vs 72g), more honest everyday pricing, or you have been burned by MyProtein reformulations in the past.
On our scorecard MyProtein Impact Whey totals 78/100 (with a value score of 95); TPW Whey 80 totals 74/100 (value 82). Value score accounts for typical price, not best-case sale price — which is why MyProtein nudges ahead despite the narrower spec-sheet lead.
For live prices and current discount codes across every UK retailer we track, use the live comparison table sorted by cost per 25g of protein. For the direct head-to-head comparison tool, see protein reviews or compare any two products directly via protein comparison. For a broader alternative list, read MyProtein alternatives UK.
