Coleshill (click on photographs to bring up bigger/better versions).
My thanks to some very helpful people on the estate who pointed me in the right direction.
pump on the NT-administered Coleshill Estate, Coleshill,
Markings: "Middleton" and "Westminster" appear around the spout, and a possible obscured date "188x".
Manufacturer: Can't find anything about this company.
Markings: The name "Ideal" appears on a pipe blanking insert, just above the stopcock.