I only know of one place who I’d really trust, but they’re a long way from Blackpool!
They have branches in Swindon, Marlborough and Royal Wootton Bassett, and they have in-house watchmakers. They charged me £450 to replace a mainspring, service and replace the crystal on my Yema, which I considered worth it, just because the watch has personal value. It turned out to have significant financial value as well, but that’s just the cherry on the top.
Whether you would consider yours to be worth that sort of expenditure is up to you.
Here’s their web address – https://www.deacons-jewellers.com
They’re handy for me, each branch is roughly fifteen-twenty miles away, so easy to visit personally.
It’s difficult to find an experienced watchmaker to do this kind of work these days, if you can locate someone near to you, fantastic, but it might take some effort.