MH1
Smile, it makes people nervous :)
CT: I wouldn't personally bother with a top on a terrarium in England, IMO- it's not like we have a low to moderate humidity environment. You have damp sphag in the bottom and a warm tank, the humidity is probably going to be high anyway- especially considering ambient humidity outside of the tank. Maybe it's more necessary with helis, but I would be concerned if you are already have problems like Sudden Heli Death. The only time your house might become dry is in Winter if you have the central heating on constantly. If I were you I would get a humidity reader and test your tank- if it's humid enough without a top, maybe consider foregoing it. You will probably get a better temp-drop without a top, too.