The better question is why were they using the car port? Most dashcams come with power adapters to plug into a standard fuse box and can be very easily routed through interior panels with basically no tools, no permanent modifications, and absolutely no expertise required.
Absolute worst case, a local garage will almost definitely do a fitting for less that £50 and it’s worth it to avoid this exact thing happening.
Leave a bowl out with a sign that says “if the bowl is empty, please knock.” You don’t even have to fill the bowl with anything.