For insulation for 54mm pipes take a look at the Armaflex, Rock-Lap and Glasswool options below and find a quality solution.
Armaflex Class O
£6.38 – £79.22
£3.23 – £65.67
£3.44 – £37.04
Glasswool Foil
£6.85 – £108.88
£7.26 – £134.23