We've had two attempts at cracking 0.8500 and the euro might nor survive a third
0.8515/20 has been support protecting the big figure and a break there will bring us another shot at 0.8500.
EURGBP 15m chart
A real break of 0.8500 will bring the 50 fib of the Brexit jump into play at 0.8369. There's support on the way down at 0.8460/65, 0.8435/40 and no doubt at 0.8415/20 ahead of the round number.
EURGBP daily chart
Immediate resistance comes at 0.8545/50 then 0.8580, should we move back up. Right now cable is looking like it wants to move lower too but it looks like GBPJPY is holding the pound side up. If cable does fold, it's likely to play catch up with EURUSD so will boost EURGBP. If cable holds up then that's the time to start looking for more downside pressure on EURGBP, if EURUSD remains on its knees.