I found a website that lists user submitted codes. Hopefully it can help you out, depending on the model. Sky codes may not work for newer televisions (depending on the version and revision you have), but since you've worked with it more than I have, maybe you can make sense of the revisions and codes.

LE40A656
SKY+ Rev 6
0646
Paul C, Renko


LE40A656A1FX /SERIES 6
SKY+ Rev 8
0646
kfj

And here's the link where I found it:
http://www.satcure.co.uk/tech/digicode2.htm#mycode

Regards,

--HDTech