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Do you have an OE reversing camera you wish to retain? That will need some new and quite expensive cables. do you want to keep the steering wheel controls? That’ll require a new £25 connector from digital sounds. if you replace your unit with a double-din you’ll need some filler inserts left and right, £10 from digital sounds. do you have an OE front camera you wish to retain? More expensive cables required. do you have an OE video (vga) system you wish to retain? if no cameras or VGA then it’s quite an easy and relatively low cost job. You’ll have loads of redundant cables at the back of the unit.

I think best option will be to locate the buzzer/s and disconnect them; hopefully it’s just a case of unplugging. If you find a buzzer and there’s no immediate plug then track the wires back to the next plug and disconnect. Might need some dashboard panel removal (eek, buy some cheap tools on eBay for the job). Once unplugged quickly turn on the ignition just to check no unexpected warning lights ... there shouldn’t be but you never know.

Ps I use the residual card slot in the dash to hold a couple of petrol loyalty cards, well, it might as well be useful for something.

Yes, it’s a Japanese road toll system. What problem is it causing? Just disconnect the plugs but I’d advise against cutting wires or pulling them out as you never know what else is connected or what could end up getting disturbed etc. you’ll probably also find a Japanese-specific GPS unit and a VICS system which provides traffic updates on Japanese roads only. All of this stuff is redundant in UK.

Dynamic sounds

I also use Tayna for car, van and motorbike batteries. So far no probs.

At that level of voltage it’ll definitely be AC

Done a few quotes and Aviva is significantly cheaper than the others AND provide a higher level of cover in several regards.