I was at the Paul Hamlyn performance and this was not the Clara that day, unfortunately I didn't get a cast changes list (nor did I get a program which were free that day), it being my first time at the ROH. I think Clara was Isabella Gasperini, but I was sat quite far away and am guessing based on the blonde hair and the fact there was a rehearsal broadcast with her and David Yudes, due to injury.
I thought Benjamin Ella partnered very well, but his solo on the day I saw him was not quite up to standard, perhaps it was good his debut was to a more forgiving audience.
The highlight for me was Beatriz Stix-Brunell as The Rose Fairy, though this did raise an interesting question, in the section where she demonstrates to Clara and Clara then copies her I felt Clara danced a lot worse than her - well it wasn't bad, it was neat and small when some of the steps can travel a lot more. I didn't remember noticing this in the 2017 cinema relay and I was able to find this section online from that relay and Francesca Hayward matched the Rose Fairy. Unfortunately the whole of the Waltz of the Flowers looked under rehearsed, the eight "corps" flowers were fine, but both the 4 men and the 4 leading flowers had moments lacking synchronicity. Marcelino Sambe also outshone the other men, I'd never want to take away stage presence, but I'd prefer it if they all jumped to roughly the same height.