Hi everyone! :)
Just to give a bit of background about the situation, I bought a hotel afternoon tea for two voucher for a friend last Christmas.The idea was that I would go with her. (She's happy with this arrangement too btw ... or possibly just all too aware that I'm rather greedy with a raging sweet tooth!
)
I think you all know where this is going, and I'm feeling so frustrated with myself! 
I had a look at an online copy of my voucher last night to check its validity .... and it mentions that it expires six months after it's been bought. And I bought it last December..! 
My plan is to phone the hotel as soon as possible to explain the situation. When I went onto their website last night, they mentioned that they could only extend expiry dates for vouchers in certain circumstances. I really do want to see what I can do, as it was meant to be a chance to really catch up and spoil ourselves a bit with a fancy afternoon tea. And I've cocked it up a bit..! 
Mumsnet, please unleash all of your glorious wisdom, charm and failsafe negotiation skills to help! Do you think it's worth a try for me to give the hotel a ring?
PS this definitely won't happen again!! The lesson has been learnt..! 