I wouldn't recommend lying- it's a risk that could come back and bite you.
I found this advice from someone who claimed to be from a debt agency
"Hi sab
In our experience, prospective mortgage lenders will invariably ask "have you ever been the subject of insolvency proceedings i.e. bankruptcy?"
It seems jumperjohn was not asked but I would say that was the exception not the rule. Lenders can, after all, search back through old Insolvency Register records if they really want to know. If you are asked the question, you should answer it honestly, but as we are seeing from some of the posts here and on other similar threads it often doesn't bother the lender if you were bankrupt once upon a time.
Dennis @NDL
"