I installed a new bathroom a couple of months ago. 70s bungalow.
Right from the start, I noticed that the WC sometimes required 2
flushes to clear toilet paper. The new WC pan is smaller the old model
and the cistern is smaller.
The WC is now partially blocked, following a toilet paper flush.
Symptoms: The water rises high in the pan, almost to overflow, then
drops slowly to normal volume.
What I've tried:
* Hand round the bend. All clear. Nothing within reach. The bend is
very tight.
* Dump a bucket of water in.
* Use a mop. I get a decent "pop" when I remove the mop but nothing
comes out. Maybe I should persevere?
* Hose pipe. I shoved a length of hose pipe round the bend. It went
about 18 inch then met a solid obstruction. I think the obstruction
was actually the waste pipe, not any compacted toilet paper + waste
(no debris was returned with the hose pipe).

Any ideas? The blockage must be in the WC area, I reckon. Why should
my outside waste suddenly block up?

Thanks
Bruce