UK Director's loan when a company ceases trading

[David Dunk]

I have a sole trader business and also am a director in a small limited company. I have a director's loan with the company that owes me £20,000. If the limited company ceases trading and after sale of all assets I am repaid say £5,000 and therefore still owed £15,000 and this will have to be written off, can I put this loss against my self assessment income?