HAPpy is a small scale local trial at Guildford hospital. Below link is an abstract from the brachytherapy conference in March this year.
Interesting other reports included a review from Guys, a larger project that found survival rates are the same for brachy patients and those having surgery, although brachy patients suffer fewer immediate side effects, and a report on bladder cancer as a side effect of brachy or RT which concluded that bladder cancer was no more likely but if it does develop it tends to be more aggressive/invasive.
Some cheerful reading then :-)
http://www.prostatebrachytherapy.org.uk/abstracts/2015_ProstateBrachytherapyMeeting_A4_Abstracts.pdf