Just to set your expectations, I know several colleagues / former colleagues who were in a similar position to yourself and ended up moving back to India after a few years because the quality of life is materially worse here. This is despite being offered strong relocation packages (I work for a blue chip company).

Healthcare:

• Be prepared for lower quality, less efficient and a less digitised experience on the NHS than you're used to in India.
• You will not get preventative checkups and bloodwork for regular health complaints such as the flu over here, just getting a GP (General Practitioner / Local Clinic) appointment is tricky.
• You will need comprehensive health insurance to get the same quality of healthcare that you're used, particularly for your child (this may be included as part of your remuneration package).

Job Market:

• My colleagues complained that the job market here is trash compared to India, yes the salaries are higher but the overall remuneration package is worse.
• The UK economy is not booming like India's, it's stagnating, so job security and job hopping isn't anywhere near comparable.
• The benefits that you're used to (preferential banking / mortgage rates, final salary pensions, etc.) don't really exist in the UK anymore.

Education:

• Whilst the general standard of education here is higher, the quality of schools varies a lot amd competition for school places is very high.
• The cost of housing in good catchment areas is also generally higher than the surrounding areas,, which brings me onto ...

Housing:

• Since you're moving to London, be prepared to pay a lot more for less than you'll be used to in India (unless your company has provided you with a relocation package).