The Quorn mozzarella escalopes are awesome, sort of like chicken parmesan for veggies when you put some marinara on top. I also like the Cauldron marinated tofu pieces (they are already cooked and seasoned, so they are very easy to throw into stir fries, etc.). Incidentally, most of the meat-flavoured crisps (Roast Chicken, Smoky Bacon, etc.) are vegetarian. The food labeling makes it very easy to see what's kosher without having to read all of the ingredients, as they always put a green V and "suitable for vegetarians" on the back of the packaging, so even if you don't recognize some of the ingredients, or aren't sure, if you look for the V, then you should be safe (and as I said, some meat flavoured things are actually vegetarian - our company makes beef and chicken-flavoured roast potatoes that are safe for veggies). I have seen the imitation sausages, crumbles, burgers, chicken pieces, etc., but haven't tried many of them. Some people have said the Morningstar Farms products are better than those, but I am sure you will find plenty that you like. I miss those veggie corn dogs!
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Even out here in the country, there are vegetarian options on the menus, usually with a V or something next to them to let you know the dish is meat and by-product free. Not sure about other places, but Newcastle (and Ambleside, when I was there recently) both have vegetarian restaurants (Newcastle has one restaurant and one pub that are all veggie, that I know of, and there might be more) so you can ask around and see what you find in your local area.
But, alas, the grilled cheese sandwich many veggies look to rarely turns up on menus here, so be prepared to make those at home!