Hi LadyinPurple,
When you say that you've found a garage that says they can get an MOT for you, do you mean a garage in Spain? Unless they 're taking the vehicle back to the UK, it's not possible to obtain a valid MOT in Spain.
Please be careful about this, as it would be illegal. Arguably, the UK garage issuing the MOT certificate would be taking the greatest risk, as DVLA do spot-checks to see whether the vehicle scheduled for MOT is actually in the test centre, but the garage acting as the intermediary in Spain is going to want you to pay cash and they won't want to give you a receipt.
Stay safe,
Kim