Good news - I managed to track down the elusive Oak Alexa at John Lewis Brent Cross!
Thanks Messy and Chloe-babe. I was like a woman on a mission this morning! Also noticed John Lewis seemed to have two of next season's colours out - a Daria tote (non-drawstring) in plum and a Bays Clutch in purple. Both beeeeeautiful colours, rich and sumptuous without being overpowering. If Brent X wasn't so far away I'd go buy the tote!