A quick Google-wiki reveals that neither the F35 or Typhoon @ respective wingspans of 10.7 or 11.0 meters would fit in the standard HS2 tunnel internal diameter of 9.1m. (That was bright, wasn't it ?)
I blame the Romans…..
p.s. The bore of the HS2 tunnels varies between 7.55m to 8.8m.
https://assets.publishing.service.go...ction_v1.3.pdf