Price probably is less the key factor than time taken - it's whether a useful or meaningful test has been carried out.
I imagine there could be people who do them for free for certain people as a charity case, but would take the time to do a proper report, while there might be people who charge £250 because the client expects that, and carry out no testing at all.
I don't see how it's possible to do an appropriate EICR in less than 2-3 hours in even perfect circumstances (unless it's a 4 fuse Wylex board with 1 socket per room perhaps).
I imagine there could be people who do them for free for certain people as a charity case, but would take the time to do a proper report, while there might be people who charge £250 because the client expects that, and carry out no testing at all.
I don't see how it's possible to do an appropriate EICR in less than 2-3 hours in even perfect circumstances (unless it's a 4 fuse Wylex board with 1 socket per room perhaps).