The ATW and East Midlands 158 disabled toilets were enlarged or otherwise improved in 2008 after the Dft sent them a letter saying they wernt happy with their current state.
No reference to other operators I can see but the 158 disabled toilets for all operators are on the RVAR 2020 compliance list assessed 2011 as non-compliant expected to be made compliant and this assessment hasn't been updated. It lists a whole slew of things they are non compliant for including corridor width (too narrow for a wheelchair to pass by), facilities inside which they would need to be expanded to accommodate and various other things.
https://www.gov.uk/government/uploa...03710/class-158-all-compliance-assessment.xls
Looking at the list the Northern disabled toilets will have to be made narrower and longer to comply.
edit: Found a news article from last year saying the ATW 158 will have to have further work on the disabled toilets to make them compliant at Neville Hill in 2016.