Let's assume for a moment that it were legal and put it this way: Say you park the thing up the backside of someone's new Ferrari and you claim on Policy #1. Insurer #1 investigates, finds that vehicle is also covered by Policy #2 and decides that Insurer #2 is liable due to the clause you mention.
Insurer #2 decides that actually Insurer #1 is liable, as they have the same clause in their policy and a long, drawn out legal catfight ensues between the two.
Meantime the insurer of the Ferrari, getting nowhere with its claim as both your insurers sling handbags at each other, sues you personally for the cost of fixing it plus any associated injury / credit hire costs and wins. Both #1 and #2 point out that their reimbursing you will only occur once their disagreement is resolved. Your car is sat in a workshop with its nose stove in, with no chance of getting it fixed in the foreseeable future and now the bankruptcy lawyers are sharpening their knives.
I believe that this is why it is illegal, to protect you not the insurers.
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