I think the page is slower to load too. It certainly seems it.
Putting it through a web speed tool (GTMetrix) it says it loads in 2.1 seconds from London, if it was on a super-fast connection. (See pic).
But when I get the tool to simulate being on a Cable connection at 5/1 Mbps, 30ms, then it comes out at 15.7 seconds! That's ages! (See other pic).
One of the main problems seems to be that the page is large. It's 5.36mb.
This is largely because all those images in boxes are much bigger than the size they're being displayed at. Se we see them as little, but in actual fact - check it out, this is how big your little box images really are
It would also help if the webpage specified image dimensions in the code, and you could try leveraging browser caching, server-side.
You could also speed it up in the UK by moving your servers to the UK (my web tool tells me they're in the US, is that right?)
MN won't only lose users if your pages are slow, you'll also probably slip down the rankings in Google for that page, google doesn't like slow web pages - assuming it is actually slower now than before - I can't test it myself but I strongly suspect it was much faster before.
Again apologies to the webteam, I hope you have gin.