Looking at the size of those structures, they would easily get up to 8 tn. The poles would be a good 3tn each, and all the joining structure would be close to 2 tn.
While there are very few machines that could do them in one go, there would be nothing stopping them from flying in the poles individually, and then hanging the supporting structure.
Doing it that way, would probably take 4-5 times as long, maybe longer, and possibly cost more! Also people up the tower while hanging the cross arms, not sure if the rules in the UK would let you do it...