Thanks everyone some good tips and pointers there! I like the idea of the porta-cot upside with something heavy on top🙈🙉🙊 not sure about sharing a swag and the human trampoline idea tho.. He will definitely be up for that.
I think I'll give him a go in "my swag" in the tent next time, see how he goes in that and if he likes it then I'll look at getting him his own.
A quality full size is the sensible idea, but once, buy right. He's not even 3 yet so a kids will probably get a good 10 years out of (maybe). Thinking smaller, lighter, takes up less room etc....