British immigration authorities demand that an applicant for a long-term visa should have enough savings to support themselves without recourse to public funds. Still, there are some exceptions: relocation to your British spouse or civil partner that can legally be your sponsor or relocation with a work visa when the inviting party bears all the expenses to maintain a foreign specialist financially.
A standard requirement for a person applying for a visa is to have at least £1,270. If this person brings dependents to the UK, the following sum is to be added:
£285 – for a spouse or a partner;
£315 – for the first child;
£200 – for other children indicated in the application.
You will need to prepare the proofs of your ability to maintain yourself financially before you apply.