I got back to the person who had told me I needed to file a tax return to ask where he got his ideas from. He said that the HMRC website states that if you have more than 2000pounds of unremitted foreign earnings in a year then you need to file and declare it.
Why would this not apply to me?
The £2,000 figure relates to those non-domiciled individuals who are automatically taxed on the remittance basis where their aggregate unremitted income/gains fall below £2,000. If, however, the individual wants to be taxed on the arising basis then a tax return needs to be lodged to this effect.
Perhaps you can give me the exact HMRC reference to which your colleague refers?