Hi
A Non Dom only needs to declares income more than £2,000 if it is brought into the UK - please refer to the following Guidance -
Tax on foreign income
please also see the following link about proposed changes -
Technical note: Changes to the taxation of non-UK domiciled individuals
You pay an annual charge of either:
£30,000 if you’ve been here for at least 7 of the previous 9 tax years
£60,000 for at least 12 of the previous 14 tax years
Thank you