HMRC Admin 8 Response

Hi,
​​​​​​The guidance at DT4617, advises that 'Where a UK resident makes a lump sum withdrawal from an Registered Retirement Savings Plan (RRSP) or an Registered Retirement Income Funds (RRIF),
Canada imposes a 25 per cent withholding tax:
Double Taxation Relief Manual
No tax credit relief is allowable, which means that the full lumpsum is taxable in both Canada and the UK.  
You can, however, claim a foreign tax credit relief of up to 100% of the foreign tax deducted, against your Uk tax liability.
Thank you.

Hi,
Ifyou call the helpline and request they escalate this for you they will be able to check if any correspondence has been issued 03002003700.
Thank you.

Hi,
If you are an individual, you would need to speak to personal tax and national insurance regarding this, you can reach them at: Personal Tax: 0300 200 3300, and National Insurance: 0300 200 3500.
Thank you.

Hi,
If you are resident in the UK and you remotely work for a foreign employer, then the income derived from that foreign employer is taxable in the UK, in the tax year it arises.  
A person who is resident and domiciled in the UK, is taxable on their world wide income in the UK:
General earnings from employment: "taxable earnings"
Thank you.