For just under £100 you can get the Licata 400 which has a good size bedroom, large living area, SIG and standing height. Very easy to pitch and you can get a canopy to extend the living space if you want. There is also the Licata 600 which may be better for an extended trip - you could remove the 2 berth pod to give you acres of living space.
Or if you have a bit more cash at the ready, I can highly recommend the Khyam Ontario tents - we have the 8 berth but they do a 6 berth. Fabulous piece of kit!!
We have a Vango Tamor - it easily takes 2 adults, 7 year-old boy and collie. We also have a Vango Vista DLX, but if you are planning on moving round and will need to put it up and take it down fairly frequently, I would really recommend the Tamor. We bought it from the Scouting Associations website in their sale last year for around £70 - it is a super little (medium sized actually) tent.
This 3 person Relum Alaska is a smidge over your £200 budget but would be very quick to put up and down, is only 11 kilos and, most importantly, is cotton canvas so would be much cooler and more comfortable for you all to sleep in in France than a nylon tent. At 1600mm high it is slightly shy of full standing height for a lot of people, but you can get a larger, taller, 4 person version, see here .
------------- Tackling life the Western District way
We have an Outdoor Revolution Scenic Premium 5, which has a large bedroom and living space, both of which are full standing height, along with a side porch and front porch which give extra space. The side porch is handy for if its raining to keep the wet stuff from inside the main part of the tent. It normally sells above your budget, but I found this site selling it for £199.99 http://www.somersetcamping.co.uk/products/outdoor-revolution-scenic-premium-5-0i-5-berth-frame-style-tent-2009-model/270/
I've not bought from this site before, so don't know what the service is like. We've found our tent to be of very good quality, and have not had any problems with it at all.
------------- 17-21 February, CCC Southbourne
Easter - CCC Norwich
June - Fisherground
August - Wooda Farm, Cornwall
August - Jubilee Park, Lincolnshire
October - Sherwood Pines
December - Sherwood Pines
Easter 2011 - Scotland
July/August 2011 - France
August - Newark NFOL 2011