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Did you sign anything in writing?
You do not owe him this money.
The agreement was clear and you have written confirmation in the recent email.
You can tell him you are shocked that he is ignoring the agreement, you don't owe him a thing and you are happy to have a court decide.
You can also consider filing a complaint with the Law Society as this is misconduct. The law society doesn't deal with fees but this is not about fees. It is about a lawyer breaching a contingency fee agreement with you.