Hiya mate - I did a full day in November which cost around £180. Really good fun and Oulton is a fantastic track
I'd suggest an open pit trackday and a full day so you're not rushed in getting lap times - you can spend the morning getting used to the track at lower speeds and build it up throughout the day etc.
Not sure if I can join you either cos of funds (will be doing more drift days this year) or just the fact that I'll be on holiday in June at some point. Will let you know but may have to book it later than Feb.