Does anyone in the UK use this program?

Well, there are 1,685 members in the London WordPress group: https://www.meetup.com/London-WordPress/

388 in Birmingham: https://www.meetup.com/BirminghamWordPress/

And, more in other parts of the UK which you can find by searching https://wordpress.meetup.com/

Oh, and there’s https://wpuk.org/events/

And you just missed https://london.wordcamp.org/2015/