Hi Joe
Of the several two-man tents I have only the Vaude Taurus UL cost less than £200, and that was with a pretty big price reduction. But it is a really good light tent if you can find one in your price range. Nice and roomy inside, stands up to high winds well, although the poles flex quite a lot, and very quick to erect. The porch is a bit small, but you can cook in it with care.
Not sure which tents Go currently stock that you could get a discount on. The new Penrith store I visited recently seemed to be full of North Ridge ones -- Go's own brand I think, and I know nothing about them. But if Go still do Terra Nova tents then something like the Voyager would be good, and probably under £200 if you could get your staff discount. Or maybe the Wild Country Zephyros 2, which has got some very good write-ups and would be well under your budget.