Concrete mahole frame and cover

Relaying and repointing patio and old concrete manhole cover and frame of approx 600 mm x 750 mm cover size are both beyond reasonable repair. Does anyone know of a supplier who may have one of these old units left over in stock in the Surrey, Hants, Berks area?
I'm not keen on recessed galvanized steel as an alternative.
Thanks in advance
Nick Spalding
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