Easiest way is to get a new lock barrel which will come with keys. I assume door is unlocked? Barrel is easy enough to remove from inside of door. Take it out & take to caravan shop to match up. Caravan door locks are fairly standard items there are not many different makes.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets