Car washes here in Germany are amazing. Take your pick: A modern self service or one at the Shell or Aral or Total. All are good and in the winter I tend to let the machines do the work, including the good underbody wash at Aral. Keeps the salt off and minimizes corrosion on certain metals. There is no need to fear petrol station washes here.
You see everything from my Abarth to a new 911 using the Aral near my place here in Stuttgart. I cant believe car wash science in the UK would be less. Im paranoid about machine wash and certainly prefer hand washing of course. Here in Germany one does not need to fear the modern automated systems available.
That being said the weather is excellent now and for the next week or so. Ive washed the car this evening and will be doing a full detail to keep winter's effects at bay. I checked the UK weather as well, looks good so get out there and clean em up

Cheers from Stuttgart! Dave