Got a chain tool so would like a decent set of Allen keys – torx 25 would be a bonus but not really essential as the disc bolts (touch wood) have NEVER come loose.

can this be beaten at £7.50?
Park Fold Up Hex Wrench Set 1.5 – 6mm

The wee park ones are excellent- very good quality. They don't do one with a Torx bit seperate, but hard to beat quality wise- they're as nice as their work shop keys.

Bondhus. Not the cheapest but they are the best.

Bondhus make the Park ones. The Bondhus tools are identical.

I'd recommend these very highly…

http://www.wiggle.co.uk/p/cycle/7/LifeLine_Hex_Key_Set/5360026437/?referid=froogusa&source=googleps

Worth getting a set of separate ones and the ball-ends come in very useful.

Assuming you want something to take out on a ride the Park set you linked to is hard to beat, for a workshop I'd get the normal Park set (or Bondhus one)

should have said – foldable

Facom Plastic handle T bars are very good but about £8-10 each

Snap-on make a good fold up set that aren't too dear

I have (…counts) four of the Park AWS10s. I've used them daily in the workshop for a decade, I carry one in my bike tool kit, one in my home toolbox and thee seems to be an extra floating around. I cannot recommend them highly enough.

(I also use a Halfords professional allen key set in the workshop – good quality and life time warranty.)

Snap-on folding

http://www.apollo11shop.co.uk/showdetails.asp?id=2274

Have the Snap On foldable here, most accurate allen keys in the garage which includes two 'pro' sets from others

Bondhus again for me, the biggest benefit being their lifetime warranty. I'm on my third set in 10 years now and when they need changing one quick call/email to the uk importer and a new set are in the post to me next day.