I have replaced the toilet cistern and when I connect the cistern to the pan with a pan-cone I have a leak from the outer edge of the cone. I have reseated the pipe in the cone several times and each time I get the same leak. Can anybody help?

Andrew, I am guessing you are somewhere in the UK and the plumbers and installation guys like me barely know what you are saying. Here is my translation: cistern= USA toilet, pan= USA flange, pan cone =USA wax ring. If this is correct you set the toilet on the flange and the wax ring is leaking, right so far? Due to floor replacement and installation variations you sometimes need a extra thick wax ring or even a flange spacer ring. OR you need a thicker pan cone or one of these 1/4" thick stackable & sealable Toilet closet flange spacers - fits 4" on eBay! let me know if I can help further, we only think we speak English in the USA.

This may help. Setting a toilet is a simple job. Tile or lay the Congoleum up to the floor flange. Put the closet bolts in the flange slots. Now place the wax seal on the flange,(see image) and set the bowl so the bolts come up through the holes in the base . Give the stool a twist to seat the seal. Now is the time,if you have china caps, to put the plastic locking wafer on the bolt first, Making sure the beveled side is down, now the washer and nut. DO NOT OVER TIGHTEN as you can break the china. If you tighten it so that you can't twist it it's tight enough. Tie in the water and test for leaks. Final step is to take a small tube of DAP tub and tile caulk and grout around the base. Clean the excess off with a damp cloth. Congratulations, you have just set your commode. This link might help you. How To Replace A Toilet Wax Bowl Ring - Fixing The Constant Foul Odor In The Bathroom If your problem's connecting the toilet tank, (cistern) to the bowl click on back. Hope this helps and thank you for rating my reply. Tom