Carrying Forward Losses To Offset Against Profit - How Many Years

I have a UK limited company that has a cumulative net trading loss of circa -£20k on the balance sheet which has been built up over several years of losses. In the most recent tax year the estimated trading profit is +£20k. There is no depreciation, capital etc to consider so the recorded losses and profits will be the same for the corporation tax calculation. I understand losses from previous tax years can be offset against the profit in the current year by carrying them forward. My question is - Are there any restriction on how many years back the cumulative losses can be carried forward from to be offset or is there no limit? Is there a link to the relevant legislation / guidance on the HMRC website to confirm this? Thank you

Hi Andrew Doyle,
No there is no restrition.
All carried forward losses can be utilised.  
Please see here:
Carry forward a trading loss
Thank you. 

Thank you for confirming this.