Just got back from a quick jaunt to Bruges myself (although not in my Fulvia).
It's only about a 90 minute drive from Calais to Bruges along the A16 and E40; sparse traffic and good lane discipline make this an easy drive. Just ensure you know you kph to mph conversion as there are a couple of speed cameras nearer the Calais end although they are well advertised (they reduce speed at busier junctions to 90 ... which is about 56).
I'm a big fan of Le Shuttle although haven't used it for a few years what with lockdown etc.
The main change I noticed caused by Brexit is the extra queueing as there are now two passport checks at each end by the English and French authorities. This means sitting around with your engine idling / stop-start traffic as there are only a few booths to accommodate all the travellers. So the main thing I'd check is you're happy with your cooling system; fan operates okay (although chilly winter weather should ease issues).
And leave plenty of time because it must have taken about four times longer to get through than I've been used to.
Also new for me was the advisement by my hotel to complete the following:
https://www.brugge.be/doorendoor/autoluw-gebied/hotels-parkingThis is effectively a permit to drive a car in the historic areas ... because you need to to get to your hotel. Presumably you're staying in Bruges you'd also be obliged to do this so if you haven't been notified by your accommodation then best check as would be a shame to get a fine.
Have a lovely time. It is a truly magic place to be around Christmas as they really go to town on the twinkly lights and festive cheer.
