Thanks for your question - I am Sam and I am one of the UK tax experts here on Just Answer.
As you will not complete a full tax year out of the UK (as you only recently left and will return back to the UK before 05/04/2016) then for UK tax purposes you will remain as a UK resident and therefore liable to UK tax, and will also remain liable to UK National Insurance (both Class 2 and Class 4)
So you will continue to complete self assessment tax returns.
But do alert HMRC of your move, and complete form P85 for them - link for this form is here
This will allow HMRC to formally advise you of your residency and tax position.
If you have any follow up questions, then please do ask. I am about to meet with clients but will respond as soon as I am available (no more than 2 hours)
I have signed a 6 month contract but this will be extended and I will be out of the country for more than 12 months.
If I get paid into a uk bank account will I be liable to tax in the uk ?
The contract states that I am self employed and will be paid gross is it the same tax system as the uk and pay the tax at the end of the year in the Netherlands ?
Do I need to pay NI in the Netherlands ?
So I can be treated as a self employed person in the UK pay my UK Ni and be paid by a company registered in the Netherlands.
Will this mean that I will be paid gross per month and pay all of my tax at the end of the financial year when I fill in my end of year tax return.
So if I am technically still a british tax payer will I fill in my british tax return at the end of the year and pay tax here.
As a self employed person working in the EU and being paid into a british bank account ( the double tax treaty I assume works both ways )
Sorry first time I have used this so didn't realise about the Rating thing.