I think we're straying too far.
To take a point made earlier that SIs were issued by MoD(PE), and as DV seems to have the actual Servicing Instruction, could he confirm who issued it? If PE haven't signed it, then what indication is there that it has been validated and verified? I did a tour in that PE department and from the info on this thread I'm fairly certain it would have been thrown back and a formal modification required.
The other point about Odiham apparently amending the SI to an in-flight SI is, as Engine says, not a recognisable procedure. You've got to wonder at what was going on higher up in the RAF if Odiham felt it necessary to resort to this.
With apologies to Tuc and Pulse1 who discussed this a long time ago on the ZD576 thread. The rest of us catch up eventually.