Yesterday I went in search of my new engine number, and found it on a flat under the O/S engine mount.
After cleaning the muck off, I can make out 4HB (engine type) followed by WY23439 and a symbol which looks like a reverse question mark. What do I put down on my V5C? My previous engine no was VB58343 so do I just put down WY23439 which would seem to be similar.
Here's another view from another angle.