If you're using it as a base for car camping, weight isn't an issue and nor is size, really.
I have a bloody enormous Eurohike tent, complete and resplendent with two bedrooms and a full size stand up porch. You could keep all your bike stuff in one bedroom, have all your friends round before bedtime, and have a private sleeping space if you want to sneak off with the current Mrs Kaiser.
Last time I used it was when I walked up Snowdon on a cold, wet February weekend. Was blowing a gale, but it kept up beautifully.
I'd have to go round to my dad's and put it up to check everything's still there, but I'd be happy to do that if you're interested in a look at it. And you can buy spares for it at Milletts if that's something that worries you.
It was about £120 IIRC, and it's only been used for about four or five trips. Yours for £40, plus whatever it costs to post?
I want light weight from a tent for my many bike tours, so I use my old (1980s) Vango, although I bought a North Face tent from the CTC forum a while ago cause it was cheap. If I was buying a new tent, it'd be a Saunders, but I have to wear out the others first, and with the Vango that's proving hard to do - they're a shadow of their former selves.