Over the last couple of days we’ve had a number of issues. It’s a fallout from the big design and back-end website management change we did recently. Since everything went live we’ve seen memory usage on our main server rise considerably, and no amount of caching seemed to resolve it. The older system used a lot less memory, but it was rubbish, so we don’t have much choice 
If you’re reading this then you’re now on our new server – an Intel Core i7-920 Quadcore CPU with Hyper Threading and bags more RAM. Everything should now be all swishy again but we’ll keep monitoring things over the next few days. Do let us know if you see anything weird happening.