The reversed arrows makes sense on funnels of actual ships (in line with the flags rule), but which version was used for static Sealink applications - logos on printed publicity material, corporate letterheads etc? I seem to recall the odd Sealink travel poster being displayed in railway stations which used the reversed arrows in print with the Sealink name.
Done a bit of digging and the corporate manual shows (rather annoyingly in my case!):
Normal BR arrow for Sealink : http://www.doublearrow.co.uk/manual/2_27.1970-03.gif
Normal BR arrow for InterCity-Sealink : http://www.doublearrow.co.uk/manual/2_19.1974-12.gif
Normal BR arrow for Seaspeed: http://www.doublearrow.co.uk/manual/2_21.1966-04.gif
However - it also states that all BR flags must have the top arrow facing the flagpole. Hence when flown normally, the BR flag was backwards.
http://www.doublearrow.co.uk/manual/1_46.1966-01.gif
Sealink flag : http://www.doublearrow.co.uk/manual/7_11.1966-01.gif
More info about rail flags in general here at FOTW : http://www.crwflags.com/fotw/flags/gb_brail.html
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