You might be interested to know that there was a write-up about the P50 in the Manx Independent newspaper for 9th November. You can see it on-line in the following way:

google: iomtoday.co.im
click the 'News' tab at the top
in the panel that appears on the left select 'News' again
then click on 'District' below
under 'News from around the Island' select 'West'
under 'More Stories' the headline is 'Hungarian boy's fascination with P50 brings him to Peel'
The article also gives the name of the transport Museum secretary, who perhaps might know if there is anything in print about the P50.