So the long awaited (by me) fast food update - I went to Wendys today as I happened to have to go to Argos which is just a couple of doors down, didn't have a lot of money to spend so got the deluxe cheeseburger and medium fries (£2.98).
The burger was IMO a little nicer than other cheap fast food options (McD's, BK) similar size but seemed a bit fresher, although that could have been because I was in there quite early.
The fries were fucking lovely and knocked the direct competition out of the water - they were still fries but were a bit thicker than the other comparable burger chains, and were skin-on with nice crispy bits of skin which added flavour and texture, not as much salt and didn't really need it as they were all round nicer.
When I have a bit more money I'll try one of their bigger burgers and a different side dish, but out of the similar priced fast food burger chain options, I think it beats the others so far. It's not gourmet food, but it's a bit better than the others.