Whether an appropriate option or nay, it's all valuable knowledge and welcome, and for the moment at least it's academic because I have bought the BSR X5M
On a positive note, on the datasheet for the Plessey deck it states there is a hexagon nut on the pickup arm vertical pivot (positioned between pivot bracket and pickup arm) which can be adjusted to increase/decrease the stylus pressure. Whether I can get it to c.5 grams I will have to wait and see once the new cartridge and stylus is installed.
Nick