The UK is price £44, not £49.
Also don't forget VAT (which of course doesn't have to be in the US price).
The UK pricing also has reduced postage costs (reduced quite a lot) compared to orderig from the US, which offsets it a bit more again. Making the total difference around four quid.
But yes, there will always be this discrepancy while the exchange rate is so rubbish*
* (rubbish from our point of view, we have to sell INTO the US, so it's a nightmare.. if we were selling OUT of the US, it'd be wonderful)
Never trust a computer you can't throw out of a window