Sounds like a leak.

Cannot find one on the pipes anywhere and it was fine when I last used it.

If it's hidden pipe work just use foam on the pipes, if it's exposed you could try lighlty greasing (vaseline sp) or applying tape (speak to a plumber for the correct type) to the taps.



Pretty hard to stop something that naturally occurs though

Very true but bloody annoying.

Locked at OP's request.