I pay £40.
Always take it to a mot centre that doesn't do work on cars as there's no gain for failing it just to generate cash.
Plus always free retests.
Headlight aim etc should usually be free within reason but I know one guy who charges full ministry rates and £7.50 a headlight to alter,and guess what?
They always need altering!!!!
Needless to say he's not turning work away right now.