Does anyone know if I can buy Natural gas in large bottles to run
household central heating & hob for a few months.

I need to have the mains gas supply & meter moved for building work to
be done and National Grid have given me a ridiculous 12 week lead time
(and people tell me that the chance of the work actually being done on
the specified date is remote). I must disconnect the supply now to
demolish a garage to continue the build work. So I need to run the
house on bottled natural gas for 3 months.

Any helpful suggestions?