'434 NWL' The First Mini Ever?

What was considered to be the only surviving pre-production prototype Mini (seen here with it's then long term owner, the late Bernard Ferriman) which supposedly pre-dated '621 AOK'. Was this really the oldest surviving Mini and just where is it today?

[@theoriginalwallace]

Hopefully it still exists! DVLA records as follows:
The vehicle details for 434 NWL are:
Date of Liability 01 03 1988
Date of First Registration 08 05 1962
Year of Manufacture Not Available
Cylinder Capacity (cc) 848CC
CO2 Emissions Not Available
Fuel Type Petrol
Export Marker Not Applicable
Vehicle Status Unlicensed
Vehicle Colour WHITE
Vehicle Type Approval
Vehicle Excise Duty Rate for vehicle
6 Months Rate £68.75
12 Months Rate £125.00

[@1959miniregister]

Really chassis number 140 re-numbered to 98 when it was sold in 1962. Reshelled into a leter shell, where abouts now not known. Not a prototype at all just the 40th normal production mini built.