I’ve finally switched hosting across to MediaTemple to see if grid hosting offers a better outcome than a server. So far, so good. I’m nearly totally up with Plesk now and now I know how to get around it, it seems easier than cPanel/ WHM. Cost is reasonable, not super cheap, but these guys are hosting a lot of big blogs so they should know their stuff if something goes wrong (and how many times have I had hosts in the past that have blamed WordPress when things go wrong). I’ll report back if it goes pear-shapped: the only negative so far is that MediaTemple simply don’t respond to support tickets in any reasonable time frame (I had one there for over 24 hours without response), however calling them directly was easy and sorted the problem out.