a KWh is a Kilowatt hopur - ie how much energy that thing will use in an hour. your electricity units are worked out in KWh.
so, if your electric heater is rated at 3kw (or 3000W), then it will use 3 units of electricity if it is on for an hour. if your electric is 7p an hour, then it will cost 21p to run for an hour.
your kettle will be rated at 2kw or 3kw. you use it for 3 minutes. therefore it will cost around 2 x (3/60) x 7p per use = 0.7p per use. so, if you have 10 boils a day, it'll cost 7p per day. if you do the same every day for 10 days, it's 70p etc.
I have one of those heated airers from Lakeland to dry the laundry and either open a window or run the de-humidifier to remove condensation - it's much cheaper than a tumble drier and works really well
For the first time in forever I put all my washing on one of those old fashioned airing racks. Put it on at bedtime and it was all dry by morning! As I left the rack in my room it gave me an incentive to put it quickly away before brekkie. Will deffo be using the tumble drier less!