As an ex-north Londoner I'd be inclined to avoid anywhere South of the airport for cost and congestion issues. Assuming you are going to be short haul, easy access to the staff car park will be worth considering. Bishops Stortford used to be a nice market town, but I'm told it has gone down hill, but drop a pin on the map here and investigate routes North, East and West. Also. somewhere which has a fast train access to London is a benefit.London on your doorstep, so you may as well use it! You could use the Rightmove website to draw a custom map for property prices.