What is this eucalyptus?

You can see in the picture two eucalyptus type trees, one bushy one (maybe Gunnii), but what is that narrow one in front?

It has been there for at least five years, and the height hasn't changed much. They don't cut it down. It must be about 15'. I took the picture today.

Thriving in South London.

 

Dunno, cant tell much from that pic, but could be E. pauciflora niphophila.

 

Thanks for trying!

I just sent the pic to Grafton Nursery, which specialises in Eucalyptus, and they couldn’t identify it, they said that it may not even be a Eucalyptus!

Shame, because I’ve got just the spot for a tree like that!