It's unlikely that anyone will see this but I am having this exact problem and wondered if the OP found a solution or not. I don't know of any old boiler breakers yards...
Thanks for replying. Sorry about the delayed reply i was away from the house.
I have had a look and taken some photos.
Link here
//www.diynot.com/network/jonpleasetalk/albums/21488
There appears to be one pump that is wired into the current programmer via some white 3-core...