The OAG Guide gives 45mins for all Stansted connections and says: "Standard Minimum Connecting Times are administered by IATA and published on their behalf".
Domestic to Domestic - 45 minutes
Domestic to International - 45 minutes
International to Domestic - 45 minutes
International to International - 45 minutes
I will give these guys a call later on behalf of my detractors here and point out the error of their ways