Try posting in the UK electrical section of www.diynot.com, you will get some good info (the respondents can get a bit sharp though, Part P and competance are their usual chants lol)

you probley got the netural cables from the rcds on the wrong neutral bars some of the wylex boars have 3 netural bars have you tested the trip times with your rcd tester test them on half trip they shouldnt trip out if they do then they faulty i install wylex boards all the time and never had a problem with the rcds

for the responses guys.

turns out i thought the wiring in was in good nick,...but wasnt lol

neutral from the electric cooker and ground floor ring main circuits were bonded together in a junction box under the floor boards. looked like someone had cut them in the past and then joined it all together. problem sorted as soon as i ripped it to bits then wired it properly!!

Glad we could help.

fanx for letting us know the result.

As Oxo-we're all still on a learning curve!.

Well apart from me I know it all!-But on behalf of my forum companions thank you-lol.

Richard.