Thanks for your question - I am Sam and I am one of the Uk tax experts here on Just Answer.
You are right you will be due a tax refund for unused tax allowances on the tax paid on you income but Forex trading is not treated by HMRC as a trade, so you cannot register the activity as self employed to have these losses claimed against your income position.
The only time spread betting is a trade is when you trade with others money or give advise to others for a fee - and that element would be liable to tax (and losses allowable) none of which seem to apply here. So you can not claim these losses as not deemed to be a considered trade.
Let me know if I can assist further
I can only advsie you on HMRCs stance on the subject (which is where my expertise comes from as I worked for them for 26 years) as its deemed to be betting so not taxable - its not a source of income its betting -
For the CFDs these do generally fall under capital gains but as you have not made a profit you could declare this loss (but its not available to offset against the income - it can only be offset against any future gains made) and unless any gains are in excess of £11,100 (Capital gain exemption allowance for the year) then you will not have a liability anyway and no need to declare the profits. But it would on reflection be prudent to declare the CFD loss for any future profits in excess of the capital gain exemption allowance.
Sorry for the confusion
Thanks for your response and I take note of your future intentions and agree this would e simpler.
re the refund as you are not working and not claiming benefits you can either wait to after 05/04/2017 to claim this tax refund (HMRC are not always up to speed with generating refunds in a timely fashion) or you can claim a part refund every 4 weeks by claiming an unemployment refund on form P50
Link here for P50 https://www.gov.uk/government/publications/income-tax-claiming-tax-back-when-you-have-stopped-working-p50
Then they will refund up to the current position with unused tax free allowances and then you claim every 4 weeks therafter until year end.
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I do apologise, then as its 2015/2016 you just make a claim now - write to HMRC with your P45 and advsie you had no further employment from June 2015 to 05/04/2016 - and they will deal with the refund due
Of course if you usually complete self assessment - then you make the claim through the completion of the return
Let me know if I can assist further - or if you have all that you need, then please do rate me for the level of service provided (or click accept)