What type of HT are you on, Kevin? If it's bicalutimide, are you also on Tamoxifen to counteract breast growth? If not, ask your consultant for a prescription for it - it does help. If you're having private treatment, there shouldn't be any problem getting it.
In my case the Tamoxifen kept breast growth at bay for about a year, but then it started up with quite severe pain in the breast area (who knew that growing breasts hurt? I certainly didn't!). I had two sessions of RT to the breast buds at the start of December which stopped it in its tracks, although it's left me with a large circle of red skin around each nipple, which apparently can take a couple of months to fade (like sunburn).