Incorrect Tax Credit Certificates

I received my Tax Credits Certificates recently and its incorrect on the plus side ie ...the revenue have given me more credits and a larger tax band than they should have ...what are the chances of them discovering this error...???

If they were to discover this mistake in a year or two would they be allowed to claim it back seen as it was their error ie i never made a claim for these credits ...???

My advice would be to contact Revenue asap.
When they come to do your 2006 return next year the error will be discovered and you could be hit with a large bill on the spot.
Check your TCC again - is it still wroing?

See this thread and please keep all related discussion in one place please.