JP, If I told you that there was a large order in the market to buy EUR and sell GBP would you be looking to sell EURUSD and buy GBPUSD, do the opposite or step aside as the order gets executed?
As you can see by this chart, while we are not privy to the order flow, there is clearly a real money selling driving this cross lower.
ON the downside, .8500 is the obvious pivotal level with next chart support at .8478. Back Above .8531-50 would be needed to suggest the order is done.
In any case, EURGBP selling has been a contributing factor to the firmer GBPUSD and EURUSD lag.