'Winter Festival Pudding' help please

As it's nearly Winter festival time i'm preparing in advance and trying to get the puddings done. I'm using Delia's recipe with a few tweaks (Dried damsons from my Gin!!) but i need advice on two points.
First is covering the puddings ready for steaming. Delia says to use a pudding cloth but i haven't got the two i'll need. Is one pleated layer of Greaseproof paper sufficient or will it let the pud get wet?
Secondly, a steaming query. Her recipe states steaming, in a normal pan, for 8 hours initially and a further two on Winter festival day but i want to use my ancient (freecycled) prestige pressure cooker. She states to steam for 2 1/2 hrs using the 5lb weight. My weight just say H and L on them with H on the heavier weight. Can anyone help me re this please!!!  :blink:

Greaseproof is fine for Christmas puddings, however it may tear if you allow the pressure to drop too quickly after steaming (in other words let the pressure cooker cool naturally). I usually use three layers or so. For pudding cloths I just get a length of cotton fabric from a haberdashers which seems the cheapest way of doing it, and looks pretty if you give them away as Christmas presents.

SS