I think this is the strongest GB showing in a men's worlds road race since Cav in 2011?
Since Cav's 2nd place in Doha in 2016 maybe.
Depends how you judge it, do you go for highest placed rider, or top two riders or ...
I've just wasted a bit of time collating GB performances since 2016 (top 20 only)
26 Pidcock 7th, Onley 17th. Montreal (McNulty)
25 Pidcock 10th. Kigali (Pogacar)
24 Onley 16th. Zurich (Pogacar)
23 Doull 18th. Glasgow (Van der Poel)
22 Hayter 9th, Tullett 14th. Woollongong (Evenepoel)
21 Pidcock 6th. Leuven (Alaphilippe)
20 No top 20. Best Pidcock 42nd. Imola (Alaphilippe)
19 No top 20. Best Geoghegan Hart 26th. Leeds (Pedersen)
18 Kennaugh 16th. Innsbruck (Valverde)
17 Swift 5th. Bergen (Sagan)
16 Cav 2nd, Blythe 12th. Doha (Sagan)
Probably at least one error in there.