Bear in mind I do not have any affiliation with any of the sites.
Personally I've used pacific health - they shipped large box with 9 bottles of stuff to Japan for about $35, so perhaps UK shipping may be $30-50.
Either way you would save more than $80 and I wouldnt expect shipping to be half of that.
I do not know any restrictions or overall quality of other two sites are so your at your own risk.
Perhaps with a little research you can find better deals for your location.