Pipe leak after shutting the water off

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Hello,

Went away for a couple of weeks and shut the water off at the stop cock, turned my boiler schedules off but left the boiler on so I could get the hot water going the day before I came back. Since the boiler uses a closed system I (maybe wrongly) assumed having the cold water off wouldn't be an issue.

First thing I did on return was turn the water back on, it was late at night and didn't realise there had been a leak until the next day so don't know if it happened while away or overnight after turning the water back on. The leak was enough to leave the floor wet and slightly warp the laminate.

Seems it must be the hep2o fittings but they are showing no sign of any leak and I've tried to replicate shutting off the water, draining at the tap then turning it back on but nothing. In the photo there are cold supplies and also the supply/return for the hot water to the tank from the boiler that has equal couplers fitted on both pipes. I've also ran the hot water but this hasn't caused any issues (I felt both pipes heat up and let it run for an hour).

Any thoughts on what would cause this intermittent leak? Not seen anything like this in the house in the two years I've been here (built 2017) but can only think me shutting off the water has done it.

One thing to note is this area has definitely been opened up before, I can see where it's been patched up (the darker wood has been used to fit new plasterboard). Previous owners also mentioned they had to make a claim against the builder due to a leak so suspect it's this.

Cheers
 

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There is a shower waste but I've checked that and not a drop (was my first suspect!). It's also about a metre away from any of the stains.

I noticed there was a hole with cables running for a socket right above the leak so even double checked the tank hasn't been spewing out water in the loft that found its way down the inside of the wall on the first floor!
 
There is a shower waste but I've checked that and not a drop (was my first suspect!). It's also about a metre away from any of the stains
Water can travel, especially if the ceiling isn’t 100% level. Could it be the silicone on the shower tray? Maybe expose the hole more? Maybe replicate by turning the water off overnight? Could it be on the heating?
 
I have no idea but I've tried everything, will have to try leaving the water off for a longer period as you mentioned. I'm not getting a single drip out of anything above that ceiling. The shower tray is the type where it's tiled inside the lip so no real way for the water to escape unless via the waste, the shower also wasn't used since going away until after the leak was spotted...

Can only think to replace all the hep2o connections in that area for piece of mind, will leave it open for a few weeks before I do anything to see if it happens again.
 

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