Over/reverse voltage protection circuit trial

[composition4]

Hi all

I'm just finalising a design and really want to protect from overvoltage and reverse voltage, there's some ICs with 12v max ratings. Trying to keep it relatively simple but obviously there's always tradeoffs. I've simulated the below circuit; based on RG's "A cheap - and good - polarity protector", but with an added zener/resistor/NPN for the overvoltage side of things.  I won't get a chance to physically test it for a week or so, but can anyone see any problems with it... or is there a more elegant way?



Thanks
Jonathan

[composition4]

Also, I realise I should probably add a diode between ground and the base of the leftmost transistor for reverse polarity protection of the transistor