During the 1970's, 1980's and probably later three Wickham Type 17 trolleys were located vat the North Norfolk Railway. Until recently these were not fully listed on the website but now are. They are 1521/1934 (M. & G. N. No. 1) https://www.ontrackplant.com/otp/wickham-01521 , 1522/1934 (M. &. G. N. No. 2) https://www.ontrackplant.com/otp/wickham-01522 , 1642/1934 (DE960243) https://www.ontrackplant.com/otp/wickham-01642 . Confirmed sightings and photographs of these are though few and far between, thus please do add any that you may have. What became of the trio is far from clear and it is possible that some or all of them might still exist.
Although in the past it has been suggested that 1642/1934 (DE960243) is the trolley at the Nene Valley Railway https://www.ontrackplant.com/otp/NVR1612 no evidence to support this has yet emerged whilst much to the contrary has.