I've had some good experiences on morning "Dine" trains to London; I did once get a "full LNER" where I asked not to have certain items and got extras of other stuff without having to ask, which was excellent service.
I am glad to see porridge is back; to be honest I will generally go for this over the "full LNER" because it is a healthier option and I am not really a cooked breakfast person, perferring a healthier/lighter option.
Heading north in the morning on a journey such as York to Newcastle is a much poorer experience than heading south in the morning. It may be due to the crews who staff these trains and where they are based, perhaps.
Similarly, a journey such as London to York in the evening is much better than Newcastle to York on an evening (the train I sometimes get on Saturdays often gives absolutely no service whatsoever from Newcastle to York).
I also try to get the 12:02 York to London whenever I can; a lot of people take this train the whole way to London. It's "Dish" rather than Dine. You usually get a couple of cold and a couple of hot drinks runs. Sometimes there is an extra run, which can either be hot or cold.
Today I tried the bombay salad; this was effectively brunch for me as I didn't have breakfast. I usually go for crumpets, but the bombay salad was much more filling despite being fewer calories. It was pretty good actually, but not everyone would like that sort of food, but I would be tempted to go for it again.
Some crews really don't like doing crumpets; this seems to be more of an issue on quieter trains where they would be able to spend most of the time chatting to colleagues. It is also not uncommon for the option not to be mentioned and the staff hope that you go for something from the trolley as it means more time to chat. However most crews are not like this; it's only a few who are.
If anyone is thinking of going 1st, the food aspect really isn't worth much and doesn't live up to the hype LNER claim on their website, however if I am able to get a good price (which, thanks to knowing the right people, I generally do!) I do very much value the extra space, and being able to work on the laptoip without someone seeing what I am doing and also having access to lounges so I can get work done, is quite valuable to me. I also like to have a window seat but also direct access to the aisle.
I find that for a "Dine" train, breakfast or lunch is more than I would normally eat at those times of day, but people with a bigger appetite than me may have a different opinon! I think everyone would agree that if you are on a "Deli" train at a time you'd want dinner, then you'd be left feeling very hungry!