Quote: "I presume its because its regarded as a debit card."
That's not the case. My Via Debit Card is accepted all over the place. Visa Elecron and Switch Solo are different to their full-fledged counter-parts, and should be considered as a cut down version.
Electron/Solo cards are issued to under 18s who might not necessarily have a high level of income. I seem to recall that during a payment transaction, it checks to see if the account has the funds available - if not, the transaction is declined. With a normal Visa Debit Card, the transaction is usually honoured, even going into an overdraft if necessary.
Long story short - Holders of Electron cards are less likely to have a lot of cash on them, therefore it's not worth the (extra) cost to the retailer of supporting that card.
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But you see, I have the will of the warrior. Therefore, the battle is already over. The winner? Me!