Wikiwirral's brilliant Ianyam has sorted it!
Turns out the leak was caused by a lead water pipe,
(Victorian house), under my bath that had been bent over to stop water coming through. The pipe was leaking where it was creased and weakened, and had done so for a long time behind my kitchen wall units without me knowing.
Well, not any more! Ian cut out a small section in a couple of floorboards, found the pesky pipes, cut them short, shaved the ends down and capped those suckers!
He worked for about 3 hours and charged me £80!
I now feel like "Dave" off the Moneysupermarket advert!
I feel EPIC!
A great job done, for a great price, by a great fella!
I wouldn't hesitate to recommend him to anyone!