TW88
This gas adaptor setup will allow you to use EN417 (Lindal valve) gas cartridges such as the Coleman in the attached pic as a backup in case your Campingaz 907 runs out. You need a CFH 52121 AV 121 Connection Valve for the EN417 cartridge and then a Gas Hose Adapter 21.8-14 To G 3/8-19 to connect this to the van gas hose. I bought these here:
and here: https://www.ebay.co.uk/itm/185333584011
and here: https://www.ebay.co.uk/itm/185333584011