Decline unfunded place and reapply?
Have you considered asking the PhD supervisors if they do have funding? UK universities rarely have a pool of funds for PhD students. These would have to come from a funding programme, where potentially your supervisor has applied to and has got the funding for the PhD position.
It might be a good idea to ask all three of them, not only to see if there would be the opportunity to develop funding applications, but also see whether they have anything in the works for next year. Funding depending on the programme and situation may apply differently to EU citizens post-Brexit. However no one will be able to tell you accurately. At least for Scotland, the Scottish government has promised that funding for EU citizens will remain the same for 2019.