Garden Shearers - Sharpening (OT)

[GarethR]

Apologies for the OT post. Have been wanting to sharpen my hedge shearers with a wavy profile blade, something like:

http://www.spear-and-jackson.com/en/razorsharp-ergonomic-hedge-shears

but not as fancy.

Has anyone hand sharpened a similar blade? Any recommendations?

Thanks,

Gareth