Thinning out a wid Welsh Blackthorn Prunus spinosa

I recently visited a friend of mine in Wales and before I left, he very kindly gave me this Blackthorn he had collected a few years previously. At this stage they are just a mass of inter twined twigs. Some dead and some alive. Now that it is finally in leaf it is easier to distinguish between the two.

The trunk line is better on this side

After much careful pruning I am leaving it here to see how the growth progresses.

I will update this thread with any new work.