Machine mart stuff is OK for somethings, but I spent thousands in there last year on my Engineering workshops. They do a metalworker bansaw, which is frankly awful. Their mini lathe tollerances are dire, and as for their ratchet spanners, utter crap. That said, some things are really good. Their trolley jack range is superb, 6 tonne axle stands give enough height to change a gearbox and various other things like their mig welders are good quality, especially the 135TE.
I bought Draper ratchets spanners, Laser crows feet, and the good old JCB 6 miilion peice screwdriver set Mark refers to (£4.99).
And, he is lying when he said 30 minutes to change the dis pack. He did this in about 15 minutes. Laidback and I watched in amazement. The best bit was how he got the dis pack out without even removing the plenum, never mind the inlet manifold I usually end up shifting forward for space.
I agree with Mark about Snap-on. They are are super quality, but they are very over rated IMO. If you would the ultimate in quality, and at a reasonable price, buy from RS Components.
The Halfords £150 set is a good 'all round' kit and will enebale you to do just about any job on the Omega.