Car won't start when cold or damp

Rover 416 1600 m reg engine turns over but won't start when cold or damp

What year?

Without knowing the year, see if this link helps:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-5.html#post520809