In reply to Jafn1997:
Around 2kg and 40-50mph winds don't sound like they go together well. To be honest, wind that strong is hard to walk in, let alone camp. Not many light tents would really be up to it.
You probably wouldn't head out to camp on a forecast that windy, and would certainly be looking for a sheltered spot if you did. So do you really need a tent that can handle that?
If space and sturdiness are priorities then you may have to sacrifice lightness. And I doubt there are any cheap options.
Except for your mostly free standing stipulation (why?) and the c.2kg requirement, one strong contender might be the MSR Tindheim. This does need pegged out to stand up (rarely an issue if camping in grassy UK hills) but is really very good in wilder weather, and also more spacious than a lot of 2-person backpacking tents.
We'll be publishing a review in a few days, but the general gist is that I'm pretty impressed.