Not a great doctor. He is extremely unorganised, and often runs very very late for seemingly no apparent reason. For example, if one patient comes out of his office, it might well be another 15 minutes before the next one comes in. He's reasonably good at helping if he can see the physical problem that you have (Hives for example). However, if it is something that is invisible, he is less sympathetic, usually dismissing it as a virus with very little empathy at all.
Short link to review Dr Mark Deverell: http://iwgc.net/edqk8