STA-BIL 22208 Fuel Stabiliser 118ml (Red)

STA-BIL 22208 Fuel Stabiliser (Red) is down to £12.99 at Amazon. Amazon shows a recent price of £19.99, so this is 35% less than it was selling for.
Its currently ranked 99 in Automotive on Amazon and rated 4.7 out of 5 from 13,314 customer ratings, so plenty of buyers have already tried it.
Key features:
Keeps fuel fresh for up to 24 months during storage.
No need to drain the fuel before storing.
Helps ensure quick, easy starts after storage.
Prevents gum and varnish build-up.
Handy for laying up a motorbike, classic car, lawnmower or other petrol garden tools over the winter, so they start easily again in spring. STA-BIL has over 13,000 ratings averaging 4.7 out of 5.