Bingo - or should I say PING!!
Thanks guys for all the help Still surprised that this got through the QA stage of manufacture (or do they not test a shield against it?)
Time to get a smaller soldering tip, but initial testing says that the join is good
Pinging 192.168.100.36 with 32 bytes of data:
Reply from 192.168.100.36: bytes=32 time=352ms TTL=1
Reply from 192.168.100.36: bytes=32 time<1ms TTL=128
Reply from 192.168.100.36: bytes=32 time<1ms TTL=128
Reply from 192.168.100.36: bytes=32 time<1ms TTL=128
Now I can try some stuff out -