Thanks for all your input.

I had not had diagnosis by ultrasound. I ended up having 2 courses of platelets injection around the tendon. Not sure if I noticed much in the way of changes in the tendon following this.

I ended up flagging the third course of the injection because it was getting too close to my national championships. Each time I had one, the tendon was quite uncomfortable for several days which interfered with training. I ran with pain and managed a 5th place finish in my event with I deemed was reasonable considering my circumstances.

Took complete rest after nationals. Didn't bother doing any rehab at all. Got back into training 8 weeks later completely pain free - and have been asymptomatic for over 12 weeks now. Nothing quite like rest - something the athlete-patient is always extremely reluctant to do.

Now that I'm back into training, I do 3 x weekly eccentric soleus work and regular stretching to keep my achilles free from the evil clutches of Tendinosis.

Cheers.