I have no advice re the repair, but I think that recovery to the specialist who can diagnose for £68 seems a very good deal in the light of your post.
I'd start there, and also even at this early stage, based on the report, have in mind the option to break the car to recover your money.
Not intended to be pessimistic, but the time to get out of a project is sometimes before you get in, iyswim.
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