Rain- Appreciating Butterflies?

News that, in spite of a generally disastrous year for UK butterflies, species with grass-eating caterpillars have boomed is interesting (http://www.guardian.co.uk/environment/2013/jan/17/grass-feeding-butterflies?INTCMP=SRCH). Meadow brown (Maniola jurtina), Ringlet (Aphantopus hyperantus) and Gatekeeper (Pyronia tithonus) have all shown increases in numbers. It appears that our recent wet summers have encouraged the growth of their preferred nosh!