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Thanks, JohnD. Laying additional joists at right angles to the existing ones would be neat, and the spacing could match standard Cellotex cavity batts. I'm concerned that the ceiling is already sagging so if I went for doubling up joists they'd best be piggyback full length for extra strength...

I want to insulate my roof void. Details are: 1895 terraced house, recently reroofed, continuous eaves ventilation plus some ridge ventilation, 100mm ceiling joists, approx area 6x4 metres; current insulation 100mm fibre glass. To use more fibreglass or other conventional insulation would need...