For pipes of 140mm, check out the Glasswool and Rock-Lap insulation options here

Glasswool Pipe Insulation 1

108mm

Glasswool Pipe Insulation Foil Faced 1.2M Lengths

Price range: £6.85 through £108.88
Rock-Lap Foil Face Pipe Insulation 1M Lengths

108mm

Rock-Lap Foil Face Pipe Insulation 1M Lengths

Price range: £7.26 through £134.23