Gas detection re water leak for parent loathe to let people in - insurance or direct?

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All a bit overwhelmed by a situation I'm in, so hope it's OK to post this here.

I'm looking for a bit of advice on a situation at my mother's property - she's 86 and was diagnosed with dementia 2 years ago, and I have power of attorney which she asked me to apply for 5 years ago. She's had very high water bills for over a year, far exceeding what one would expect from one person's usage in a small house - I've questioned this with Thames Water who deem there to be a water leak. They sent an engineer out last year who states that the leak isn't external so not Thames Water's responsibility to fix. They also said that the stopcock in the property needs to be isolated - the problem is that a plumber (who I've used a few times who seems reliable) says that what the engineer is referring to under my mum's sink is only to isolate the cold tap, and that despite a thorough search of the property, he couldn't locate a stopcock.

This leaves gas detection as the best means of moving forward. The problem is that my mum is very wary of letting people in the property - it took 5 visits for her (over 8 months) to allow a smart meter for electricity to be fitted, usually sending the engineer away. I don't have any direct personal contact with my mum anymore, owing to quite a long history of her being abusive to me, leading me to feeling very suicidal 3 years ago. Her social care team have said that they'll facilitate the situation re a visit. I haven't looked into whether the gas detection will be covered by her Saga home insurance - I'm foreseeing my mum not allowing entrance to the gas detection team, so don't know if I'm just best off paying for the detection bypassing insurance. Thames have set up a payment plan for 3 months and will apply a leak allowance, but once that 3 months is up, they'll be looking for a considerable amount, so time is of the essence.

Has anyone else here had experience of arranging something like this for a parent or relative who is loathe to letting people in? I don't mind saying that I find it triggering dealing with things like this on her behalf owing to trauma resulting from her going back to my childhood so just want it to go along as smoothly as possible. How invasive is the detection usually?
 
I can’t comment on the parental side or the gas detection side and feel sorry for the situation you’re in. It could be something as simple as a toilet seeping water into the pan, but this should have been identified by your existing plumber.
 
It could be something as simple as a toilet seeping water into the pan, but this should have been identified by your existing plumber.

Perhaps an underground leak, especially if it's an old pipe. Is the floor a solid one, suspended timber, or is there a basement? If suspended timber, best to check under the floor, for a flood, which can be quite damaging.

The water authority, should have been able to check whether they could hear the flow, at the external stop tap.

You need the plumber to insert a main stop tap, as a matter of urgency.

There is a bit of information on gas water leak detection here - https://www.sewerin.com/en-gb/products/water/tracer-gas/variotec-460-tracergas
 
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Perhaps an underground leak, especially if it's an old pipe. Is the floor a solid one, suspended timber, or is there a basement? If suspended timber, best to check under the floor, for a flood, which can be quite damaging.

The water authority, should have been able to check whether they could hear the flow, at the external stop tap.

You need the plumber to insert a main stop tap, as a matter of urgency.

There is a bit of information on gas water leak detection here - https://www.sewerin.com/en-gb/products/water/tracer-gas/variotec-460-tracergas
From memory, it's a solid floor.

So rather than going ahead with gas detection firstly, a main stopcock is the best plan of action? I don't have a clue about this kind of thing so feel free to explain as if you were talking to a child!
 
From memory, it's a solid floor.

So rather than going ahead with gas detection firstly, a main stopcock is the best plan of action? I don't have a clue about this kind of thing so feel free to explain as if you were talking to a child!

Yes, in an easily accessible location.

Turning that off, should stop the water meter racking up consumption, and cost.
 
From memory, it's a solid floor.

So rather than going ahead with gas detection firstly, a main stopcock is the best plan of action? I don't have a clue about this kind of thing so feel free to explain as if you were talking to a child!
A main stop valve will let you test in stages. If you close it, and still have a leak, then it will be something outside.

I suspect that Thames mean there is no leak on their supply pipe, there is no way to check yours if you can't turn the mains off in the house.
 

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