Hazel, I to suffer at this time of the year with voice problems, I have been told by very wise people it is lot to do with pollen count and that.
Drinking loads of water this weather certainly helps - and did I say this? no alchohol as we all know this dehydrates you..
Also I really suffer from the "Mudgies". This year acting on advice I have been taking vitamin B complex coupled with spraying meself with "Jungle" beastie repellant and this seems to do the trick.
I have been told that a skin preperation from "Avon" is the best anti midge thing going.
See you at Warwick this weekend were we can compare potions.