Monty was a fabulous horse & threw lovely movement & temperament. Sienna had a couple of sleepovers at Nibeley when she was baby & partied with a bunch of youngsters that would now be 12 & 13 so your boy wouldn't have been around then...
Have you contacted Josie or Bernard at all, or visited - it is really worth a visit, lovely place.
I spoke to Bernard a few years ago. The Stallion has now gone back to the Maesmynach stud and they are more difficult to get hold of- I would love to see Monty though- even just a picture!
My horse has the best temperment of any horse I have owned in the friendly stakes although sometimes a big scaredy cat!