There's something very odd about this. You say that you have had to have a survey done on the property you rent - tenants don't get surveys done, landlords do. Do you mean you've had to let a surveyor in to the property to do a survey? This would be normal if the landlord is remortgaging. I don't understand why you've seen the results of the survey if this is the case?
Also, a mortgage lender wont be interested in whether you're tidy or not, that's nothing to do with them. All they are interested in is whether the borrower will be able to make the repayments or whether they'll be able to get their money back if they have to repossess.
Are you sure this is a surveyor?
Also, you don't actually have to let anyone in to the property whilst youre renting it, you dont even have to let the landlord in if you dont want to unless it's an emergency. It's called quiet enjoyment of the property.