I think I have a leak in my new pond. Whets the best way to find it? it
can't be very big, the pond has gone down about 2 inches overnight, I've had
a look but can't see anything obvious- no bubbles or anything, I've check
all the pipework and that seems OK.

I'm using a liner by the way, Unless it is just the liner 'settling' as I
only filled it up yesterday?