Thanks for the excellent feedback Steve!

I didn't think about using a PBP software solution. I'm using the 4550's USB & trying to get things to work with an ENC28J60. Unfortunately, when I received my Ethernet PICtail daughter card it didn't contain the latest Rev B5 silicon, which supports SCK from DC-20MHz. I will likely upgrade otherwise SCK needs to be >8MHz, as per errata.

Regards,
Marc