Where can I get my Weber DCOE 40 carbs set up from? In the London Area and what should I expect to pay?

There's a good place out in Reading... Can't remember the details off the top of my head but they've got a RR and wideband combo and well used to working with Webers and Dellortos.

http://www.ccengineservices.com/

track and road

the main thing is to get them balanced you can then set the mixture up yourself a rough guide is the colour of the plugs. Im sure someone has posted the link on here for the basic set up. Do you know if you have the correct jets etc

Or go oldschool and use a colortune. I know people mock but I like 'em.

set mine up using a carb balancer and checking the colour of the plugs done 7k no problems

My old chap would have just listened to them to balance and probably been as accurate as a carb balancer. Those old mechanics take some beating