Hmm very nice! I wish I had seen this post about a sale sooner.
When you are at Machine Mart pick up a 3/4 knuckle bar as well. The breaker bar in the Halfords set will not be long enough for many things that you need the 3/4 sachets for. 
If it's the Halfords sale you meant, Paul, it's still half price on all their Advanced Pro socket sets

If it's the Machine Mart one you meant, well, you know those are like buses, another one will be along in a week or so!