[gdal-dev] OSGB36 to WGS84 transformation

[Johnny]

Hi,

I am trying to convert OSGB grid references to WGS84, but do not succeed
and don't understand why? 

I use

: echo "SD8015002109 "|gdaltransform -s_srs EPSG:27700 -t_srs EPSG:4326 

which gives 

: -7.55729138544866 49.7667307394399 50.4807807941111

If I use [1], the result is 

: 53.515279 -2.300819

which can be verified as correct on maps.

What error am I making in assuming this should work?

I use 
GDAL 1.9.1, released 2012/05/15
Fedora 17

Thanks!

Footnotes: 
[1]  http://www.nearby.org.uk/coord.cgi?p=SD8015002109&f=conv

-- 
Johnny