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anything else I need to worry about here? (they are/were red engineeeing bricks)
For it to be affecting that area I'd say it's more likely that it is the pipe not being properly lagged and condensation forming on the outside. From my experience failure of pushfit pipe fittings progresses so unless it's literally started in the last 6 months it would have been noticed a while ago (assuming it's not the failure mode caused by a clown forgetting to put the sleeve inserts into the pipe before joining it to the fitting - but when that goes wrong it's sudden and catastrophic).
Bobbo
Also think I’ve found the source of the general wetness at the back of the house.
to the left of the chimney breast the water pipes are boxed in (to the left on the first photo - boiler currently above in the back bedroom) - and I can feel water along the grey pvc pipe that comes down there under the floor across the back of the house eventually to the downstairs loo on the other side.
Will be pulling off that boxing in (new boiler/plumbing happening, so dodgy push-fit fitting (my assumption/hope - the rusty metal plaster-holding-corner-strip-thingy supports this, I reckon) should be sorted by default in a few weeks with any luck - just need to clear out the sub-floor here and get things dried out.