Mr Plasterur

You will need to dig foundations for the brickwork which would normally be 100-150mm thick , usually 450mm below ground level.

The problem with cellars is penetrating dampness caused by the water pressure in the ground acting on basement walls , if a wall feels damp then it will still be damp no matter what board you use. Before you board out the cellar i would recommend that you get your cellar walls tanked , theres many systems available including trowel applied systems i.e. a plasterer could apply these systems cheaper than a more traditional preservation company(who would employ a plasterer to do this anyway). Depending on system you could then either dot and dab walls with plasterboard or build freestanding parti