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@walkmanman
Glad to help. And it's good to hear toe overlap isn't an issue. Central London can be pretty hairy due to the craziness on the roads, so anything else (poor bike setup etc) to add to the risk is obvs not good.
As for your fork setup, I'm not sure what the nut could be rubbing against your tyre, I'd just have thought a bigger tyre would be catching against the underside of the brake caliper? Anyway, have a look at this link for a pretty standard TT specific brake: https://www.velobase.com/ViewComponent.aspx?ID=646C7485-0C31-48D0-8FC9-4B48AD7FF455&Enum=117&AbsPos=34
They might be designed to work with slightly wider tyres, although at the same time a lot of the guys at TTs back then were using tiny tyres like 20c and less, and they liked the clearance between brake and tyre to be low (as with rear wheel in relation to a bike's seat tube where they wanted 'fag paper' clearance between the two) so I'm not totally sure if the small drop will help. There might be some more info on the above Velobase site though.