It is IIP tracker with only 9 ranks. O.D., Dulc., Clarabella and StBass at 8' with Principal 4' on the Great and Gambe, Lieblich Gedact and Violin D all at 8' on the Swell. The usual pedal Bourdon 16' as well. The Violin Diapason apparently replaced the original Oboe 8' (making the organ slightly less interesting!)
It is not clear whether the Organ builders Chenery & Lock were the original builders or simply responsible for the renovation in 1976. I'm afraid I've been too lazy to look them up to check.
There is a photo of the organ on the NPOR page.