Harry,
I spent the whole afternoon spent trying to get any sort of False Colour from the few I took the other day.
Not knowing about the white balance bit at the taking time, I resorted to trying most combinations of white balance from 2600k through to 7042k on the RAW file. Even following a few processing sequence clues posted on the net I keep ending up with a B&W. I have read that as the IR cut off gets higher up the range as with filters like B+W 092 and 093 images only go that way, no colour. So maybe my diy job falls in that range. Blue skies to follow your method are I fear a few days away.
Decided that I will lash out the £35 on a Hoya R72 tomorrow. Should be interesting anyway, as I will be able to compare its results with those from the film strip filter.
I need a new cable release anyway, as after 20 plus years mine has fallen apart. Norwich has WHE, London Camera Exchange and Jessops, unless of course the old fashioned job is now not stocked by anyone.
Don