In the first place, there is no such thing as a 'UK ATPL' - The UK has not issued its own licences (except for the NPPL) for a number of years, only JAA licences. Secondly, it is not clear what licence you hold - Spanish national or JAA, CPL or ATPL - without which information it is difficult to give a proper answer.
It is the case that the UK does not issue type ratings endorsed for co-pilot only and, therefore, cannot issue a rating on the basis of one from another JAA Authority that is so endorsed.