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We had trace/locate as part of our home insurance. They turned water off, drained the system and then filled it with a detectable gas and went around with a wand and picked it up fairly accurately.
They've just this morning come round and done this exact same thing with us. We have a 'massive leak' under a limestone floor, which is a bit upsetting. We can see it through a removed tile, there's literally water spraying out and dripping all over the joists and floorboards underneath.
The chap is trying to access through tiles that are under the worktops so fingers as we don't have any more floor tiles to replace any that we would have to rip out otherwise.
For others in this situation, Insurance covers the cost of trace and access, water damage and making good - it doesn't cover the labour and materials for actually fixing the leak (which is odd, but not the main cost).
You can apparently contact Thames Water, tell them you had a leak and you've fixed it and they often reimburse you the cost of the excess water. I wasn't expecting that, and that would be good as it was a massive bill.
We had trace/locate as part of our home insurance. They turned water off, drained the system and then filled it with a detectable gas and went around with a wand and picked it up fairly accurately. Happy to pass on details if needed but don't think we did more than just Google. Ended up needing a fair whack of kitchen out/make good work, so might be worth looking at insurance too.