Spring still progressing slowly but determinedly towards your visit, Paul! I found a modest 34 species at one site today - modest, because several things that will definitely be on the wing when you come out hadn't emerged yet, including ilex hairstreak (which I know you want!), marbled skipper, purple-shot copper &c. I also didn't see a green-veined white, which normally comes as standard!!
But here are a few piccies of what is out now - in most cases just freshly out:

Provençal fritillary,
Mellicta deione, ssp.
berisalii. A few males (no females) flying today.

Swiss zephyr blue,
Plebejus (pylaon) trappi - again, just a few males today.

Olive skipper,
Pyrgus serratulae.

Glanville fritillary,
Melitaea cinxia.

De Prunner's ringlet,
Erebia triaria.

Southern small white,
Artogeia mannii.
Guy