No terambulan, your hard earned donations are to fund political campaigns and posh offices, company cars and inspectors who won't come out to an animal in distress unless the BBC cameras are present but will visit a careful responsible dog owner if a neighbour complains that it barks.
The PDSA do have a scheme to help in cases like this, but they don't pay all the bill. I think you have to be on some sort of benefit, but you will need to find out.
Ask the vet if you can pay in instalments, and explain your circumstances as they might be able to do a deal for you with the specialist, particularly if it is a teaching practice.