[Radio Wrangler]

I think that Marconi and Racal weren't so much creating ISB receivers out of general purpose jobs so much as when any new receiver was being planned, it was intended to take wide ranges of options and ISB was just part of the mix.

Doing this sort of work caries the risk that you could lock-out something you later need to do, so the safest approach is to design everything in at the beginning and then to progressively introduce things to the catalogue later as needed.

Of course, when our librarian got the request to destroy a copy of a journal, the journal interest factor went through the roof and lots of personal photocopies got made. Racal had to object, Marconi had to try to retract and the publicity made everything so much more prominent. Rather like banning a record boosts sales (I like playing 'Je t'aime' on ecclesiastical organs)

David