It might still be possible to have Focal treatment with a T3A, depending on location of the tumour as I did, although also depending on location, it might be HIFU, Cryotherapy or Nanoknife (Irreversible Electroporation). HIFU is an easy and certainly repeatable in need with milder side effects than Surgery or RT. I had two treatments with HIFU to sort out my tumour following failed RT and have been in remission for several years now. So to learn whether you are a suitable candidate, you could do what you previously considered and be referred to UCLH, who are the leaders in Focal treatment in the UK.