That's a relief!

I checked my bank balance online almost an hour ago and there was a £300 difference between my balance and available credit!

I phoned my bank in a bit of a flap to find out what was going on, the person who answered my call checked for me and said that the £800 for the wheelchair had come out of my available credit but not my balance yet and that I'd be in credit when the payment came out of my balance and the other money was my overdraft.

Panic over!  lol