thanks chaps,
I was thinking of bending up a couple of old coathangers myself!
I did wonder about thermal imaging but knowing nothing about plumbing wondered if it would work - I thought the logic was sound but often it doesn't follow with the practical.
The house is 4 years old - so I...
Turned on the heating and the pressure drops to zero in one hour. When the downstairs heating pipe is turned off the pressure stays constant so there must be a leak on the down stairs loop. BUT all the floors are solid and tiled. Been suggested that it is necessary to dig up all the ground...