Just send it to them as they probably owe you some tax. you can print the form off the IR website. You will need your P45 from your last job in the UK.

Your best bet is actually to call up HMRC and talk with them. If you don't owe any tax, it's just a paper shuffling activity, and you might be due a refund.

If you do owe tax, you're still better off declaring. You'll have to pay interest on the tax due, and maybe a couple of penalties, at the very worst.

I use colfina for my swiss affairs, they seem to be economic and knowledgable at the same time

http://www.colfina.ch/kontakt/index.html

Denise speaks very good English.

In the UK I use MP saunders and Co who are specialists in contractor accounting and also knowledgeable about the ins and outs of the activites of the gougers at HMRC

http://mpsaunders.com/

To genuinely escape the clutches of HMRC is actually a bit more convoluted than you might think and you should take an accountants advice. I have met people bankrupted by them on return from a sojurn abroad (personally I think their motto should be labor destruens unt paupero populi). It is worth getting advice

It really is not necessary for you to go to the expense of getting an accountant. The Inland Revenue will explain exactly want you have to do and if any payment/refund is due.
I remember meeting a IR chap once (he was nice and extremely helpful) and he told me that so many people go to the expense of getting help when in fact you can call , make an appt or write and they will provide the information for free and you get the info straight from the horses mouth.

And get yourself bankrupt via accountant fees instead!

You might want to read this helpful thread before you rush off and confess anything,

(Proposed) New UK residency rules

Quote from above: there is an XLS with flowchart questions to determine your status. http://www.hm-treasury.gov.uk/d/cons...nline_tool.xls

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Thanks for all replys,

I've been in touch with HMRC and hopefully should receive a reply within a week. I'm hoping it should be pretty clear cut, I was unemployed when I left and I don't have any income/mortgage from the UK now. Fingers crossed its just a case of making everything offical and correct, albeit 18mths late!

The trouble is that you get HMRC's interpretation of the info, which isn't always exactly correct.