Have you tried M&S? I'm pretty sure they do plain white iced cakes, because I had one for my first wedding. Mind, that was 11 years ago, so all bets are off!
Ooh, here, is this any help? http://www.marksandspencer.com/gp/node/n/72561031/275-7986779-9767952?amp;mnSBrand=core
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Ooh, here, is this any help?
http://www.marksandspencer.com/gp/node/n/72561031/275-7986779-9767952?amp;mnSBrand=core