Yes a granny charger (three pin plug) would do the job nicely.
Octopus Go would probably give you the cheapest deal at 8.5p per kw. If you can do your washings, dishwasher etc during the cheap period you will be charged 8.5p from 00:30 till 05:30.
The only person who got all his work done by Friday was Robinson Crusoe.
Anything i post over three lines long please assume it is an article lol.