London Sunday afternoon and evening

Food tour on a Sunday? Brick Lane and Spittalfields market... Endless choice of yummy street food from any country you care to mention. Many, many dishes... £5-6 a go generally.

From Euston, Northern Line a few stops to Moorgate then change to Met. Line one stop to Liverpool Street, short walk from there.

Spitalfields is first and that would be enough tbh... Onwards to brick lane if you're able.

Ideal times 11am to 5pm.

After 6pm on a Sunday, you'll be limited to chain outlet food at best, London is far more limited at that time.

If ur heart is with the museum, do that, maybe have afternoon tea there.

If your heart is with the food, do that.

Doing both might not work.

Random thoughts:

From the front of the British Museum, it's a 10-minute walk to the original location of Neal's Yard Dairy, open to 19:00 for cheese tasting and purchase.

With the same timing but different direction, you could get a hot salt beef (corned beef) sandwich at Tounge & Brisket. I mention this because of a similar recommendation from a foodie friend on my first trip to Britain 24 years ago.

My chocolatier sister recently told me to stop at Paul A Young Fine Chocolates but I didn't have time.

I have marked this South Indian restaurant for next time that I'm at Euston station.

To save possible misunderstandings, a "van" has a different meaning in the UK, it's for transporting goods not people.

Excess Baggage Company https://www.left-baggage.co.uk/en/locations is near the way down to platforms 16, 17, 18 on the concourse at Euston Station. Not cheap but convenient to you.

It is way too early to be able to check closures either at Euston or on the tube, but Sundays are prime candidates for tube engineering works, especially on the Circle Line and its hangers-on while Crossrail works continue; and the HS2 boondoggle is going to continue to affect the high numbered platforms at Euston during those works so subject to periodic closures of that part of the station.

So the moral is - as time nears check for alterations which may affect your choices.

Neal's Yard is closed on a Sunday. You would need a second mortgage to buy from there!

Shops have restricted opening hours on a Sunday, but this doesn't apply to restaurants. There isn't much around Euston that would be open on a Sunday except for at the station itself, as most of the independent cafes will be closed. Pubs will be open, but some will only serve food at lunchtime. There will be plenty of places to eat in Soho but relatively little tapas.

British museum has some cafes that are ideal for lunch, I like the ones n the central, covered courtyard. One is soup, salad and sandwiches, the other has a varied menu with a choice of hot dishes. There is also the pizzeria on the main floor, pizzas and salads.

I'd go to Euston, deposit my bags, head to the Museum and have lunch there and spend as much time as you want there then head out for dinner. Actoually of you stay at the BM until 17.30 you will have just under four hours to have dinner, get back to Euston, pick up bags, find train and seats etc.

Recently found the website OpenTable.inc. type in the area you are interested in and it gives you listings, maps etc. The Euston listings were certainly interesting. The Booking Hall in the St Pancras station certainly appealed with high Victorian architecture and a British menu. If you just Google restaurants near British Museum for example you should grt lots of lists come up.

Are you travelling 1st Class on Caledonian Sleeper? If so you can use the Virgin Trains 1st Class lounge at Euston.

Normally boarding is from 22:00 on Sundays, 21:10 is the time they use on the very rare dates that the train is diverted via the East Coast Mainline. Which seems to be the case on your trip! This means they will miss out all the other stops in England and you should get a quieter ride. It will arrive in Edinburgh very early but you are allowed to stay on board until 08:00.

The diversion will be due to engineering work on the tracks, which at this time will be in the plan but circumstances could change. Confirm the departure time sometime in March just in case the plan has changed.

Just want to mention a tapas restaurant we visited last time we were in London, Tapas Brindisa, located in Soho. Wonderful tapas! You may wish to drop your bags at the station, walk south to the British Museum, spend awhile there, then walk about 10 to 12 blocks southwest to Tapas Brindisa. They are located at 46 Broadwick St., London.
Here is their website:https://www.brindisakitchens.com/restaurant/tapas-brindisa-soho/
And here is their menu:https://www.brindisakitchens.com/wp-content/uploads/2016/10/20170905_Soho_ALC_Final.pdf

On Sundays, they are open 12noon – 10pm.

Nearby are Oxford Street and Regent Street, both interesting places to walk and see the shops. Found on Regent Street are Hamley's and Liberty of London (actually down Great Marlborough Street off of Regent St.).

The other location which may interest you; Tapas Brindisa has a location at Borough Market/London Bridge, 18-20 Southwark St.https://www.brindisakitchens.com/restaurant/tapas-brindisa-london-bridge/

This location is open on Sundays 10am-10pm.

That location is not as convenient for you as the Soho location, but just thought it's possible you'd want a look around the famous Borough Market. Southwark Cathedral and the Shard are nearby sights worth checking out. Hope this is somewhat helpful.

Tongue & Brisket...yum, yum, yum......but closed on Sundays.

After the Museum it might be time for a traditional Sunday Roast at a nearby pub.