Hi Oscarab
CTC and WTC will be going, at some stage claimants in receipt of CTC and or WTC will be invited to apply for UC. Itis recommend not to apply for UC until you receive letter from UC inviting you to apply, if you apply before receiving the invitation letter then you will loose transitional protection.
A number of WTC/CTC had applied for UC when they received a leaflet sent out by HMRC informing claimants about applying for PIP and had assumed it was the invitation letter.
I would advise you to seek help from your local Welfare Rights Organisation, they will be able to take all your circumstances into consideration;
advicelocal.uk Gary