Hello and welcome to the site. Thank you for your question.Now that you have moved back to the UK, you should advise HMRC of changes to your circumstances. I presume you were registered for self assessment before you moved abroad in Jan 2007. If so, then you already have a UTR (unique tax reference) number.If you moved back post 6 Apr 2013 then your first tax return for completion would be for tax year ended 5 Apr 2014.If the above applies, you can file your tax return online. You need to register at Government Gateway to file your tax return online. As an alternative, you can download the main tax return and supplementary pages, complete and return to HMRC before the deadline of 31 Oct 2014. The deadline for filing tax return online is 31 Jan 2015.If you don't have your UTR number to hand or have forgotten it, you will have to contact HMRC and they will send it to you in the post.Now, if you were not registered for self assessment before, then you have to register for SA first. This can be done online. More information on this can be found here
I hope this is helpful and answers your question.
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Many thanks for this.
Should the consideration that I may not have completed a P85 upon leaving the UK be a cause for concern? Can I complete this form retrospectively?