Hi Dave, that doens look like an escort one to me, they look more like this

http://cgi.ebay.co.uk/IDLE-SPEED-CON...QQcmdZViewItem

they are situated on the rear of the inlet manifold, quite easy to get to so IMO i would remove it and have a look before parting with any cash

i have an escort one at home somewhere, if i can find it ill get some pics of it for you