If you are camping in the garden just to give your young son an
experience then surely your husband can rough it for a night or two?
Your son will probably have more fun in the smallest tent you can find.

Hi Alan

The point is that we want to see how it goes in the garden first, before
going further afield later on. My husband isn't keen on small tents in
the first place, that's why I was asking!

Lynda