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I am not a huge fan of lateral jumping of ships given that Indian joinees are more like kids who change schools after class 10 to go to a new one. They haven't trained with their English law peers so they still have work-related challenges to meet plus it's difficult mixing with the cohort when you are that senior. With the TC it's different since everyone starts the same, people know each other, have got each other's backs etc.

One more advantage of doing a TC is the 'T' in TC. It's not just legal training that I'm referring to here, go and look up the kind of training that their trainees get during the TC. Essentially, as a lateral hire you miss most of that and are expected to be at par with the rest of the cohort when you join as a lateral.

TC is the way to go despite the long winded qualification process. When you study the PGDL and the SQE courses with the rest of your trainee cohort, it is, IMO, far better than doing an LLM that has 0 real life value other than the signalling effect which only stupid fellas fall for. Just look at how the PGDL and the SQE prep forces you to think like a lawyer even while you are at university.

All in all, make up your mind. CAM SAM karna hai to vo bhi sahi hai but ANGREZO ki dukaan karni hai to shuru se karlo, beech me mat ghuso.
for salary upto 3pqe have a look at https://www.rollonfriday.com/inside-info

cost of living in london will be as following:
flatshare with 1/2 colleagues or friends in zone 1/2 - £1k-2.5k pm (bills included at higher end if not then add another 0.3k pm) https://www.rollonfriday.com/accommodation-offered
food - £1k pm (if you rely on takeouts for 50% of time, on average costs a min of £12 per meal on a deliveroo takeout)
drinks - £0.5k pm if you go to mid level pub 2/3 times a week
public transport - £90pm
entertainment - £0.5k pm (varies a lot from person to person)

in general £3k pm can be reduced to £2k pm (if you go out rarely and can cook)

if you are planning to stay for at least 3 years buy a house
https://www.rightmove.co.uk/property-for-sale/map.html?locationIdentifier=REGION%5E87490&minBedrooms=2&maxPrice=650000&minPrice=175000&numberOfPropertiesPerPage=499&propertyTypes=detached%2Csemi-detached%2Cterraced&primaryDisplayPropertyType=houses&includeSSTC=false&viewType=MAP&mustHave=&dontShow=&furnishTypes=&viewport=-0.267162%2C-0.00348982%2C51.4739%2C51.5476&keywords=
mortgage is calculated at 4.5x the yearly salary, so with a salary of £150k pa you will get a mortgage of £675k, you would need to stump up 10% so 60k, so your budget can be around £650k, its possible to get a good house in zone 2, sell the house at a profit after 3 years if you want to return to India

finally my advice would be to talk to someone who is working in the UK and who is from a similar background to yours, before deciding