What happened was a slightly different experience. Forgive the lack of pictures as I wasn't planning to do this as a review. There are more on their twitter page. I was in a hurry so chose something near the top of the menu (a hotdog wrapped in bacon called the BaconDog I think) and added fries so I wouldn't be hungry. I turned down the drink which confused the server and was surprised it was over £5. It took longer than I expected for the food to come & this is what arrived.
First up this is a lot more food than I'd pictured and was a pleasant surprise. Those aren't fries. They are chips, freshly fried and had cut and really some of the nicest chips I've had in a long time. The sausage is similarly freshly cooked - no sitting on a rotating heat source here. The meat is German market quality - and it turns out I could have chosen other kinds like beef too! The sauces seemed a little unnecessary as they are on the table but I did say yes to all the trimmings. The bacon was a decent sized sheet and wrapped securely around and not just shoved on top.
All in all - this wasn't a snack, it was a meal. And a good one at that. I went from thinking it was slow and expensive to thinking it was a decent deal and speedy considering it seems to have been made from scratch. Even the confusion over the drink was explained by a more detailed reading of the menu - £5 gets you a meal deal so with the bacon I'd turned down a less than 50p drink.
Looking like a 'splash and dash' diner I think hurts BigDog a little. Once you know it's quality and appreciate the experience it's a lot easier to understand the position it occupies. It's an American style diner which should be as busy as Nando's opposite is, but I think it needs a few more pictures of the quality goods in the windows and a bit more 'special offer' about the meal deals to entice people into the store.
It's barely more expensive than a meal deal at many of the fast-food giants and a darn sight more tasty. Will go back, and if they have veggie options I'd even take my partner. Well recommended.