I've been looking for a large tent for ages and have waited for the post-summer sales to see what drops in price the most. This is the best deal by far (I think) and it's a Vango so comes with 2 year warranty (extendable to 3 years if you register it on Vango's website).
If you want a matching porch, Vango are selling two sizes of last year's models (in matching Epsom Green colour) on their eBay shop at reduced prices. £79.99 for 240cm wide and £89.99 for 345cm wide. They're called Universal Premium Side Awning Canopy.