ChrisF, the model shop is marginally closer to Central but isn't too far from either station. The ironbridge in another country would cross a tempestuous swollen river but in Exeter it crosses ..... well .... hardly anything apart from a valley ..... it is just surrounded by buildings.
George's Meeting House is a Wetherspoons more central in Exeter but it isn't the most inspired conversion of a church that I have seen. The White Hart, an old coaching inn, in the same street is much nicer. Just 10 mins walk away the old quays provide some good places to eat, drink and have pleasant scenery.