Visited the Shenley Church End Holy Thorn again on 6 January, Old Christmas Day, 2020. Still no flowers fully open, though some buds had petals showing.

Examined the trunks more carefully and concluded that there are three, possibly four, a covering of ivy making it difficult to make a precise count.  The trunks if visualised as forming a circle, create one of c. 1m in diameter, suggesting that the original trunk decayed many years ago, and subsequent trunks have also decayed.