The ABS Cut off switch mod is what Joe's talking about.
I think I may wait for a cheaper second hand unit to come up...
I know they have a bad reputation but I think UK Lotus Center have a few more in stock at £162 delivered, I just fitted mine today, took all of 2 minutes.
My main problem with this is that my car is currently SORN'd and in the garage, so if I buy a unit for £162, then I wont have a chance to see if it works/is correct until April. At which point i'd bet UKlotuscentre wouldn't want to know!
G
I think I'm right in saying that those who have had issues when swapping the ABS unit over have always had the ABS light come on so it should just be a case of turning the ignition on to see if it is working correctly.