For the difference in price between Vango's own tunnel tarp and the Coleman awning, I would say that the Coleman is the better buy. For a few more quid I think it gives much more useable space, because the poles will sit either side of the door rather than the middle.
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.