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Method A – Enclosed in conduit in an insulated wall
Method B – Enclosed in conduit or trunking on a wall
Method C – Clipped direct
Method 100 – In contact with plasterboard, ceiling or joists, covered by thermal insulation not exceeding 100mm
Method 101 – In contact with plasterboard, ceiling or joists, covered by thermal insulation exceeding 100mm
Method 102 – In a stud wall with thermal insulation with cable touching the wall
Method 103 – Surrounded by thermal insulation including in a stud wall with thermal insulation with cable not touching the wall

(reference: https://www.diydoctor.org.uk/projects/cablesizes.htm)