HMRC Admin 10 Response

Hi
If the PAYE account for the business has been closed, you do not declare this in the return as you didnt have  a 'live' employment in the year of the return.

Hi
Strictly one should be closed but as no funds have been added there is no benefit.

Hi
1. as already on your P60, you dont need to report tyhem anywhere else.  
2. you may want to report the loss so that it can be set against any future capital gain.

Hi
That is correct.

Hi
As this is not actually foreign income for you to claim foreign tax credit relief, you should be looking to Belgium to claim the refund from them. You should still declare the full UK income in the return as you are UK tax resident.

Hi
You will be entitled to personal allowances once you are UK tax resident, as will your wife.
The savings allowance is £2000.

Hi
The P45 figure will only be the taxable income so will already include the taxable element of the redundancy payment and the tax deducted so you would not need to declare separately as this would duplicate the figures.