CAN ANYONE HELP?

Hi thereI know very little of butterflies, but i saw one today and am having difficulty in identifying it. Can you help?I have seen an actual real Purple Emperor in France (the Dordogne, a couple of years ago), and I know it was because the first thing i thought was ‘wow’. The one i saw today did not make me go ‘wow’, but rather, ‘what the bloody hell is that?’It was black and white, with more black than white. It was around 2.30 to 3.30pm. The weather was warm to hottish (when the sun came out) but very windy. We were at Waverley Abbey, Surrey (near Farnham) and there is a lot of rough pasture/meadow and associated plants, many types of deciduous trees, including oak and various willow types. We were standing next to an oak tree on the banks of the River Wey at the time.Having scoured butterfly websites, i think i might have narrowed it down to either a white admiral or a female emperor. My husband thinks perhaps a white admiral, but the description of the gliding flight of the admiral do not in any way match up to what this butterfly was doing, which was moving at very high speed with fast wing beats.I’d be quite happy with a white admiral, but happier with a female emperor.Can you help me????YoursNiki Lall