On the GOS field trip to the Kenfig Saltmarsh today Alun John noticed a small butterfly which turned out to be a Brown Argus. I thought it might be a bit early, but when it was joined by a second one this lessened my expectations a bit. However, some digging around suggests it is early and Richard Fox reports via Twitter that it's the first seen this year.
The location was south facing slope of Morfa Tip that last year saw an early Large Skipper, probably no more than 100yds between them. The microclimate created along the stretch just north of the reedbed certainly appears conducive to early flying butterflies.