[dazzlevision]

Here's some information from an issue of the "Murphy Service News" on Murphy TV channel coils, from Band 3 converters up to the V410 series.

From the change of basic part number between the V310 and V410, I think it's safe to assume that, from the V410 series onwards, until the Astra Mark 2, the RF valve was a 30L15 and so required different coils to the V310 series (which used a 30L1 / PCC84).