Happy to help. Fortunately London restaurants have generally survived the pandemic well, although it has been difficult. There have been a couple of big closures at the high end of the dining scene, notably The Ledbury (my fav in London), The Greenhouse and Bar Boulud. One thing I have really noticed is that London has become much more casual. Some of that was already happening, but the pandemic has taken it to a new level. All the restaurants below can be done with relatively casual dress. I went to Restaurant Gordon Ramsay over the summer and wore a suit, as I have always done, and felt over dressed.
But, lots of new places have popped up and are surviving and some even thriving. Here are some of the key ones:
Core by Clare Smyth (Notting Hill) - I think this is hands down the best place in London now. Nearly impossible to get a table but if you get on a waiting list or check open table, you might snag a spot.
Kol (Marylebone) - This place is really cool. Santiago Lastra is doing a Mexican tasting menu sourced from only local ingredients. And he is doing it really well. There is also a great Mezcaleria in the basement that is good for drinks and snacks. London and the UK are finally discovering good tequila and mezcal. When I first lived here 10 years ago, Cuervo Gold was generally the ceiling.
Frog by Adam Handling (Covent Garden) - did the tasting menu here before Christmas and it really impressed. Cool vibe, great food and just on the edge of Covent Garden.
Osteria Romana (Knightsbridge) - this little Italian gem was something we discovered after a night out at the V&A. Really great Roman cuisine, reasonably priced and a good local haunt.
Louie (Soho) - now this place really delivered, went there last weekend for dinner. It is a former chef from Brennans (NOLA) that opened up a restaurant in the old L'Atelier de Joel Robuchon space on West Street. It is definitely worth a look, but don't expect a Brennans menu. There is a classic French twist to it (Paris Society group backs it) and the food is not as rich/heavy.
Carousel (Fitzrovia, formerly Marylebone) - they have rotating chefs that come through for a few weeks at a time. It is usually someone about to open a new place in London or a solid guest chef
Kingly Court (off Carnaby Street) - tons of great casual restaurants here and a fun place to eat and drink. I would recommend Imad's Syrian Kitchen, Korean Dinner Party or Dishoom
Two Texas themed places I am dying to check out are Sonora Taqueria (Hackney) and Texas Joe's (South Bank), just haven't made the trek over there yet. Other than that, just let me know what area you are staying in and what you like to eat. Will do my best to recommend, although the areas I know best are Marylebone/Fitzrovia/Mayfair and to a lesser extent Soho and Covent Garden.