They're forecasting a cold winter, my central heating ceases to work
during a power cut and I seem to get lot of power cuts.

I have, in the garage, a large leisure battery, a 150 Watt inverter and
my central heating boiler and timer.

I can see how I could simply rig up a system which could be unplugged
from the mains and be reconnected to the inverter during a power cut.

Are there any issues with this?

TIA

Another Dave