The day after the last post about filters, Toddy got in touch and said that he had one similar to the unit shown in Steve's pic. A phone call the next day soon had it hot footin' it's way south. Made by The British Filter Company it should fill the bill nicely, and the filter element looks very similar to those retro fitted to T140s which will be a result if they do fit.
Paul also got in touch around the same time and gave me a link to this, being produced today in England. Well worth investigating, if not for the Ton Ten then for the future, check it out in more detail HERE