Don't change to electric.  The power stations lose their gas before domestic customers when there's a supply crisis.
Surely we will still produce electricty from
coal, nuclear and renewables,even after gas
has become too expensive to generate electricty.
 I think people will forget global warming
once they start suffering power cuts, and will
burn a lot of coal
OK, how do we rank the evils: commercial gas shortage, commercial electrical shortage, residential gas, residential electrical? I think they will be rationed this way:

  1. commercial NG will be cut (without the power stations!)
  2. commercial electricity will be cut/rationed
  3. residential gas will be reduced (you will not freeze if you need to lower your thermostat!)
  4. residential electricity will be cut as a last resort - remember all people that heat with electricity (and also vote)

Turns out that electricity is a better failsafe option IMO. And in the light of the coal and nuclear plants whose building is becoming an almost certainty in future, think it is the right long-term investment. A geothermal heat pump if possible will be best.