You can get it from Merlin Motorsport in the UK:
http://www.merlinmotorsport.co.uk/HEAT-INSULATION-Thermal-Sleeve/c36_479/index.html
http://www.merlinmotorsport.co.uk/HEAT-INSULATION-Thermal-Sleeve/c36_479/index.html
I fail to see why they have a case. I passed a mobile van at 80+ when overtaking but as I slowed down when I was out of danger I wasn't breaking the law. Gift cops if they do you for this. I would imagine the PF will throw it out.
rob if you need a good lawyer or barrister in these matters give me a shout , i had a very scary situation myself and managed to get it quashed , with the help of a great few people behind me , if not id defiantly argue it , as im aware your allowed to speed up to overtake