you get a bigger market in the uk, and hence by association you...

you get a bigger market in the uk, and hence by association you are exposed to europe. bigger market, bigger exposure and hence higher SP. then you get arbitrage. And for those who aren't familiar with the term: A technique employed to take advantage of differences in price. If, for example, ABC stock can be bought in New York for $10 a share and sold in London at $10.50, an arbitrageur may simultaneously purchase ABC stock here and sell the same amount in London, making a profit of $.50 a share, less expenses.

so if you think the price will be higher in the UK (which odds are it will be) buy a sh$tload here, and then sell them in the UK.