I know of a certain person who brough him/her self a full Y single from LGW-EDI just to use the lounge before his/her delayed EZY flight (some 5hrs delayed), then refunded it once he/she returned from holiday!
I've seen many in the LGW Lounge with EZY/FCA etc boarding passes, after entering the lounge on a full Y Business UK Ticket!
Cheers