We never use our rad now ... we never camp in UK, so no need ... only June/July/Aug on the continent.
Not that we've never had 'chilly' ... mountains at night can be ... but nothing that's warranted that use of space and weight.
We did have one of those, Mucker, but it got ditched under the gluten reduction campaign!
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.