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@Scilly.Suffolk
If it's 1st generation then should be 112mm: can you check this? You should also know that the reason there was a 2nd generation, was because Laurent Fignon crashed out while leading the 1982 Giro D'Italia when the spindle snapped...
Yes, C-Record is just an abbreviation for Corsa Record (1985 - 1990). 2nd generation Record (1991 - 1994) also used 111mm spindles as did the rest of the "family": Croce D'Aune, Chorus, Athena and Veloce.
Yes, new chain rings are readily available (135mm BCD).
I can well understand that you don't have pockets deep enough for Super Record (C-Record is just as expensive and good Chorus isn't a long way behind), but if you aren't going to use the matching cranks then I really don't see much merit in using your BB; it's a flawed design (hence G2), getting on for thirty years old and at best it will be a bit of a bodge job (112mm BB with 111mm cranks).
The BB is the least important part of a restoration job (it is only apparent on close inspection) but one of the most crucial parts of a working bike (the drivetrain is built around it and huge forces are put through it). A period loose bearing BB for C-Record era cranks can be had for about £25, which is about what you will pay for a modern cartridge BB.
Apologies if I am banging on a bit, but having a 1991 Ian May and a 1989 Peugeot, I speak from bitter(sweet) experience.