Be gentle as this is my 1st post!
Halfords are currently giving away a Halfords Advanced 8 Piece Screwdriver Set worth £19.99 when you buy any Halfords fully or part synthetic 5L Oil.
You can reserve online and collect in-store - prices start at £18.99.
The oil and screwdriver set both have decent reviews. I actually purchased the screwdriver set alone a few years back, and seeing I needed to buy oil for my bike it was a very welcome surprise!
At my local store (Frome) there was no signs of this offer by the oil. I asked at the till, there was a display basket full of the screwdriver sets next to the till.
The website doesn't seem to mention how long the offers available - in hindsight I could've asked in store.