Fortunately that kind of thing has been outlawed in Scotland. Letting agents can no longer charge supplementary fees to tenants.

"As a result of this consultation, we will make it crystal clear to tenants, landlords and their agents that all premium fees, over and above rent and a deposit, are unlawful." - Housing Minister, Keith Brown

http://www.bbc.co.uk/news/uk-scotland-scotland-business-1937...