There were many Orange tip butterflies around but only a Speckled Wood settled long enough for a photo. 
After checking Thursday’s patch of bluebells again and comparing them with one I found a couple of miles away I conclude that the local ones are not hybrids.  The extra shows how the shape and colours of petals of the native British bluebells differ from the Spanish bluebells.  The British flowers have long narrow bells and the pollen is cream coloured whereas the Spanish have short wide bells with blue pollen and hybrids are in between.  The different leaves and spikes are the most obvious signs to me.