Blimey - just stepped through most of the CFS model for a 'laugh'.
I know it's highly unlikely to happen, but that models shows a repeating pattern of:
1. Azores High staying put, pushing a weak ridge our way for a day or so - couple of days without rain mainly in the south
2. A week low...
I'm not sure about the next couple of months, but the next couple of weeks look like more of the same... so nothing hot, no sustained areas of high pressure over the UK and no proper summer.
I'd hazard a guess that we'll get a perfect summer setup in late September / early October though...