[CaptainCrash1971]

Hi Sam
you don't say which model C5 you have, but according to whattowcar.com states that a standard C5 2.0 HDi towing a 1000 kg trailer would be a perfect match, read the report

Important for safe towing is the weight ratio between Car and Caravan. The weight ratio (loaded caravan / kerbweight tow car) for the Citroen and is 67%. The match between car and caravan is perfect.

The towing performances of this Citroen with your trailer are perfect (performance index = 103).

You may expect excellent performances from this outfit. On flat roads it's easy to come along, in which case top gear is applicable in all cases.

On motorway inclines you will be able not only to come along, but be the first at the top. On steep roads you have more than sufficient power to keep going. On hill starts there will be more than enough power to get going, provided the wheels have traction.

I reckon just keep the citroen and use it, tow bars are cheap enough and easy to fit, the car will easily handle towing a trailer. We used to tow a 1200 kg caravan the full length of the country with a pug 306 estate 2.0 HDi, and the only problem we ever had was on the motorway we used to get a bit of a sway on. With the extra weight of the citroen, along with the lower centre of gravity of the trailer this wouldn't be a problem for you.
Even with a 1.6 HDi it comes back as a perfect match, so I say keep it.
Hope this helps
Alan