Hi I have just got a 07 rrs and if i drive for about 2 minutes at constant revs fault codes come up on my dash
only selected gears working
lowering suspension
hdc lost
i have to stop turn it off and restart then its fine again
if i drive blipping accelarator its fine
im thinking something to do with egr valves any thoughts

Hi Welcome to the forum and Land Rover ownership.

You will want to get the fault codes read before doing anything else. These will paint a more detailed picture and allow for a more educated guess as to what the problem is.

When I had EGR problems the symptom was a complete loss of power - foot flat to the floor and the revs would hardly budge. After a few minutes it would loosen up. No warnings lights or warning text. Definitely get the faults read.

used britpard iid reader says excessive exhaust gases

You've either got a faulty/dirty MAF sensor or an air leab between the MAF and turbo (extra air is being drawn into the system that isn't being measured but is being picked up by the lambda sensors.

Does your reader show which bank is reading the error ?