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currently working on plastering the staircase at home and have hacked all the existing plaster from the walls. I am going to dot and dab them with 9.5mm thick 6x3's but this even with tight dots comes out over the skirting of the staircase or the timber running up at the sides of the stairs is there anyway to fix a new skirt on or wud it be too much Fuc$ing about?

Just plaster the wall and forget about dot & dab

The staircase has to be a minimum width ( the actual tread) for building regs. Adding timber to it could make it dangerous

floating it is!

ha, found those stair regs:

4.3.3 Width of stair flights and landings

The effective width should be measured between handrails or, where there is no handrail present, between any walls or protective barriers. It should be clear of obstructions, as described in the diagram to clause 4.3.1. The effective width of a stair should be in accordance with the recommendations of the following table:

Private Stair

900 mm [1], such as from one storey to another or connecting levels within
a storey; or

600 mm where serving only sanitary accommodation and/or one room ,
1. the effective width of a private stair may be 800 mm where a continuous handrail is fitted to both sides of a flight

4.3.4 Number of rises in a flight

Generally, a flight should have not more than 16 rises.

4.3.10 Stair flights consisting wholly of tapered treads

A flight consisting wholly of tapered treads, forming a helix or spiral, should be constructed to give safe passage. To achieve this, it should be constructed in accordance with the guidance in BS 5395: Part 2: 1984

You can view the full list of stair regs here

You are going to save a lot of work by plastering the wall