If you're looking for an easy way out, I can heartily recommend the 'Cook' range of frozen meals. Some need to be oven cooked but others can simply be microwaved. They're as good as many expensive restaurants meals are, if not better.
The main course for my Christmas lunch usually consists of something like this
https://www.cookfood.net/products/Rump-Beef-brandy/
which I simply zap in the microwave and serve in a giant Yorkshire pub (from Asda's frozen aisle), with possibly a few spuds and/or sprouts.
https://www.cookfood.net/menu/christmas
(Having just looked at that link, I'm now getting a bit worried about the bit that says many of their festive specials have already sold out. However the dish in my first link is one their year-round offerings, so I hope that I'll still be able to find it in one of the several 'Cook' outlets in this area).