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Hello Terrence, I am one of the experts on Just Answer and pleased to be able to help you with your question.
You need to declare all the income you receive, not just that which you bring to the UK, to HMRC at the conclusion of every tax year [5 April]. You will then be sent a bill for the Income Tax (IT) and National Insurance (NI) owing. I assume that your employers are not deducting this. You are not entitled to Seafarers' Allowance as you do not spend sufficient time afloat.
I am so sorry to have to convey such dismal news.
Unfortunately no, you have to be afloat for 365 days. Actually it is the Seafarers' Earnings Deduction and the entitlement is [source: UK Gov Web Site]:
'To get the deduction you must have:
After deducting your Personal Allowance, currently 11.5K, the firt 34.5K is taxed at 20% and anything above at 40%. I assume that your income will not rise above 100K.
Thank you for your support.