Oops I hit quick reply instead of quote. This is intended for PUCCI GALORE!
I don't know how long you've had the account and therefore don't know if you have any vouchers, but I think they used to send a letter to let you know if you had earned one.
Anyway, perhaps call this number: 0344 493 3349 and give them your details. They will likely ask for you avios membership number, but I can never remember mine so I just give them my postcode etc and they start from there. If you have any vouchers I'm sure they will be able to tell you.
Good luck!