[postgis-users] custom EPSG codes?

[chrispg]

I have data in British Nat Grid that I would like to load into postgis.
Normally I would use EPSG:27700 to do this no problem, but the coordinates
are to decimetre precision, not metre, so 27700 is out by a factor of 10. I
can edit the spatial_ref_sys.sql to generate a custom projection file, but
then performing any queries on that using the PROJ4 libraries are a problem
as it is not recognised. Has anybody come across this before?

Any help much appreciated.
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