Kevin,
If your kettle is 2kw and your toaster is also 2kw thats a requirement of approx 16.7amps to run both at the same time.
I.e 4000/240v = 16.66666amps, even more if the sites electric supply is 230 or 220v. CC site supply is 15amps but a lot of other sites are only 10amps and some only 5amps. Your breaker is probable only 10-13 amps so again the maths say don't use both at the same time. Make a brew, then do your toast or use gas for one or tother🙂
Brian