When I attended the then Northampton Town & County Grammar School in Billing Road in the 1970s (now Northampton
School for Boys http://www.nsb.northants.sch.uk/ ) there was a Conacher organ in the main assembly hall. No mention of it now on the school webpage and no signs I could see in NPOR. I think it was two manuals plus pedals and was originally a cinema organ, as it had such things as second touch and a grand piano hooked up to it by pneumatics which didn't work.
Our music master was Stephen Cleobury who was also organist at St. Matthew's, Northampton before he moved on to greater things. One of our chemistry masters, Dr. Whiting, also played it on occasion, and I can remember one Saturday given over to a series of recitals by at least four invited organists.