I think the issue would be if there's enough volume of the prostate left to get the seeds in to after it's been hollowed out, and that might depend how aggressive the HoLEP was. It's probably regrown sufficiently in 12 years that there is, but that would be a question for the radiation oncologist. HDR might be an option if LDR can't be used, but you might need to transfer somewhere else for that (and indeed the LDR too). If you would need to transfer somewhere else, you need to ask them about the brachytheapy, and if your hospital doesn't do it, they won't have the detailed knowledge to say if you're suitable or not (which probably won't stop them offering an opinion, but it may not be accurate).