I was walking my dogs on the Cotswold Hills, earlier this month, which is mostly grasses growing on Oolitic Limestone. Whilst I was walking, I spotted a tiny butterfly settled on a purple meadow flower. It caught my eye because of a bright blue body. More details below...
Body: bright blue
Wings: about 1-1.25cm when closed
Closed Wing colour: White with sort of grey / creamy circles in a pattern
When it took flight, the inside of the wings were a deep lilac
Unfortunately, both pictures I managed to get are too blurry to see anything helpful. Maybe if people could post pictures in their replies, I might recognise it
The list starts with hairstreaks and coppers (it won't be in there) and ends with Duke of Burgundy (not that either); it will be between those - amongst the blues. Note that with many species of blue, the female is somewhat brown. If yours was predominantly blue, it was probably a male; you've just got to try to find one with the right shade of blue (very tricky because of lighting) and the right pattern on the underside (tricky because of subtle differences).
So, you may not be able to ID it exactly; you may have to settle for it being one of a handful of possible species.
Whatever it was, I'm sure you had a lovely walk in the rolling Cotswold hills, made all the more memorable by the fleeting companionship of some of its more charming denizens like that blue. Methinks you might return.