Whats the difference between the £40 nike mercurial vapuors and the £140 nike mercurial vapours?

Can anyone help?

Someone else will know more detail than me, but if you cut to the chase the 140 pair are much much better material and are lighter and don't break as easily. The 40 pound pair are very cheaply made and it's noticable. I'd go for the 140's if you can afford it, but there are a few pairs of the 40s which are nice.

You mean the talarias???

I think your talking about the Talaria's vs the Vapors
Talaria's are the cheap model
while the Vapors are the top of the line