Last month bought an SDHC USB adapter (£1.75) and a triple set of own-brand 8GB Class 10 SD cards (£12.99) from 7dayshop.com claiming to support up to 20MB/s. One card wouldn't even mount but found this open source tool (for Linux or Mac) very useful to test the remaining memory cards: Michel Machado's F3 (repository on github).
