On 2009-05-01, Bob Minchin wrote:

I rang TP and they were one of the suppliers who said 450 minimum
I also looked at wickes and whilst they have the fancy priced stone
ones. I'm looking for plain grey concrete ones.

Those ones I linked to are concrete, and they come in dark grey,
yellow and pink. I've got the yellow ones, and there's no way
you could possibly mistake them for stone ;-)

-Paul
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http://paulseward.com