Thanks, Graham.
The specialist was very clear that it often does not work or masks pain and makes things worse, yet can be helpful for others. Having said that, I'm considering having another... I did try natural recovery and rested from early November to early Feb (I also skull fractures and other injuries) as I couldn't really do much - but the tendon pain actually got worse over the enforced rest (Nov - Jan.) and that's why we decided on the injection which was great for nearly 3 months, with just general soreness starting to return now. Cheers.