how can i stop door opening

[balliali]

My sitting room door always stayed closed enough to keep room warm and stop the fire from smoking from lack of air. However lately, when I just push it closed (but not tightly) it swings back open again. Is there anything I can do to stop this. I have tried the obvious things, like putting door stop behind it.... but that's a nuisance, also don't need it spring loaded etc. Suggestions appreciated!

[heathfield]

Hmmm. How about fitting one of those brush-type draught excluders? The friction from this would probably be enough to stop the door moving by itself.