There is no individual tax
Business do pay tax at different rates depending on the level of profits
All income earned overseas is exempt from UK tax providing you are resident overseas. To be resident overseas you need to work outside the UK for an entire tax year. That is from 6 April to 5 April. March to March would not be good enough and you would technically be required to pay tax (however they are unlikely to catch you).
Tax in qatar is very simple
There is no individual tax
Business do pay tax at different rates depending on the level of profits
All income earned overseas is exempt from UK tax providing you are resident overseas. To be resident overseas you need to work outside the UK for an entire tax year. That is from 6 April to 5 April. March to March would not be good enough and you would technically be required to pay tax (however they are unlikely to catch you).