HMRC Admin 10 Response

Hi
As you can only pay into 1 cash ISA, each tax year, you will need to decide which one you want to keep as the ISA and close the other. any interest received in the account to be closed will form part of your personal savings allowance to be classed as taxable income.
HMRC will contact you in due course to confirm any actions.

Hi
The £3600 is the gross amount you can pay in to receive tax relief - if already appied at source you can only pay £2880.
You can still pay in £60k as this is the annual allowance but you will not receive any further tax relief on this.

Hi
No ,you enter the full interest received and the allowance is applied in the calculation.

Hi
Once you submit the return, the statement will update to take into account the payments you have made direct and a revised balancing payment, if applicable, will show.

Hi
Yes adjusted net income will be your gross income before dedcutions.

Hi
You will need to pay tax on this as it is over £1000 and would be seen as a 'trade'.
If not already regstered for self assessment, you would need to enroll and fill in a tax return.

Hi
please refer to article 11 of the treaty -UK/TURKEY DOUBLE TAXATION AGREEMENT

Hi
You will need to contact our Online Helpdesk for assistance.
Technical support with HMRC online services

Hi
No you cannot claim these as they were not incurred by you.  
The rental business was also up and running when you inherited the property and as such you have no start up costs.
Beginning and end of a rental business: commencement