Only when you do something stupid like announcing unfunded tax cuts ala Truss. I think most people (and the city) would deem re-joining the customs union as eminently sensible.
Economic growth will be the key to their (and the country's) success and yet they are still ignoring the obvious solution. Caution as a strategy is all well and good but not when you keep telling everyone that the country is broken. Sometimes you have to do what is right even if a large minority...