Online shopping in the UK?

[reddragdiva]

Just went shopping and had an asthma attack from going outside in 1°C. I've heard quite enough horror stories about Tesco's online shopping service (site looks nice, but is reputedly consistently shite at making an actual delivery and would substitute a side of beef for a watermelon). Waitrose-Online doesn't seem to work in Mozilla, and ocado.com doesn't seem to stock obscure items like, ooh, apples. So how is Sainsbury's (whose site at least appears sane)? And are there any others I haven't listed here?