London restaurant for big birthday lunch

[DeathStarCanteenGal]

Help me please!
Am looking for ideas for somewhere to go for lunch for DHs 60th. Have posted in travel, but thought would post here too to maybe get different ideas.
We are coming down from Scotland to London for the weekend for Dzhs birthday. Staying on the Southbank and going to see Abba Voyage on the Saturday night (close to my idea of hell, but never mind)
Only other thing scheduled in to go is to take teen DD to the big Primark on Oxford Street...
But would like to go somewhere nice for lunch as it is a big birthday. Want somewhere that's quite relaxed though - no dress codes as I don't think DH owns a tie and DD will only wear converse high tops..
It also needs to be able to accommodate me (veggie) and DD who will barely look at a vegetable, So maybe a nice Italian?? or a posh burger place?
But would like somewhere that feels a bit special either without being too formal or fancy.
Any ideas??

I stumbled upon Ochre which is new I think and part of the National Gallery or Portrait gallery very close to Trafalgar Square and it looked pretty nice. They were very nice to me and my friend even though we only ordered bread and butter and some drinks.

I've only ever had wonderful meals at Bocca Di Lupo and Il Portico

La Goccia in Covent Garden is also lovely. If these are too fancy there are quite a lot of pretty posh chains/franchises around the centre which feel lovely but a little less fancy. Ivy brasserie in soho is a good example.

Thé Brasserie of Light in Selfridges feels very special and is nice and central for your Primark needs.

Another Bocca di Lupo fan here. Never had a bad meal there. Relaxed but great food.

The Savoy Grill is amazing. Lovely relaxed atmosphere. No need to dress to the nines x

I went to Brasserie Zedel for my birthday and really enjoyed it. Had steak though. Absolutely lovely surroundings, and staff and not too expensive!

Berner’s Tavern is lovely, near Tottenham Court Road.

Any Hawksmoor restaurant

Ave Mario in Covent Garden fits your casual dress / teen friendly / Italian needs.

Covent Garden / southbank is slim pickings for foodies. Trullo N1, Spring (Somerset house), Duck and Waffle or Smiths of Smithfield for the view, agree Bocca di Lupo lovely but was pretty hectic when we went for a big birthday recently. Though fun

Don’t really need to dress up anywhere in London (certainly no ties etc) etc except for super fancy Michelin. Even there, generally see some tech bros in t shirts. So no worries on that front, we are scruff bags :)

Budget?

My dc always want to go to comptoire libanese, there's several branches but will settle for Cote. Both won't break the bank and no dress code

I went to Seabird (not too far from where you are staying) for my birthday in July.

Gorgeous decor and good. Mix between stylish and relaxed. Not sure when you are going but if it's a bit warmer you can sit outside on the balcony. Gorgeous.

https://www.google.co.uk/search?q=seabird+london+photos&ie=UTF-8&oe=UTF-8&hl=en-gb&client=safari&si=AKbGXpc25Q-f0BAdbY1LskCwHK6bFnBoUNmwv6nqiPfYZj-VHi60hpExHcGDr0t07iy1nh2sh0ojhX5vpKKZBDHK7HWTN9ykrE29wcSKk1Wyg0BJrIRpY2f5XNwWDNDWq91UI5fNJG&ictx=1&ved=2ahUKEwjrggy8zKaEAxVuSUEAHa0hC8MQibgLKAB6BAgkEAo#lpg=cid:CgIgAQ%3D%3D,ik:CAoSLEFGMVFpcE4zaGp6Vy1iVWJZNlY0WTN1aW5xM1NpeFBiajJPY3BfSTluQXR5

Sea Bird looks amazing. If it was just DH and I it would be fab, but nowt on the menu DD would eat...
ruling out Hawksmoor cos I'm a veggie and can't even eat chips there!!
but was looking at Ave Maria, which looks like it might work for everyone..
but fairly flexible with budget
and we're down in the middle of march, so probably not quite the weather for drinks on a terrace somewhere..

Sea Containers House is lovely l, by the river