In the 7 years I rented, the first few years there was never a renewal fee, then suddenly they asked for £60 and when questioned why they suddenly wanted money to electronically sign a pdf said I should have paid every year and to consider myself lucky!
I managed to ignore them for probably 3 years without paying it but I do remember the last year we renewed they hounded both myself and my partner as well as the landlord who was phoning us up moaning about whether or we intended to stay or not so paid that year.
Things like that really make me hope I never have to rent again! Not because of the landlord as he was ok, just snotty agents.