"MRI on Disk - £50!!!!!!"

Back problems have flared up again during twin pregnancy and have been told there's nothing they can do until after pregnancy... Midwife recommended physio/chiropractor and I have made private appointments due to waiting times. Asked Warrington NHS for a copy of my MRI which was undertaken months ago and they will only provide it to me for a charge of £50!!!!! . I am aware of other NHS trusts which charge £5 - £10 to put it on disk so I am absolutely disgusted at this.