Hi Mike, The power consumption stated in the manual, is 75Watts. However, to be on the safe side and to stop the transformer getting too warm on long sessions, it would be best to go for a power rating of at least 100Watts. Since there is only $5 extra on the 200W unit (in the www.220-electronics.com site) I would be inclined to go for that one - it would run really cool.
Also, if the board was intended for UK use, it will have our 3pin plug, moulded on the mains lead, which will not match up with any of the sockets on the transformer unit. However, the plug on the end of the mains lead, which mates with the KN is fairly universal so you should be able to obtain a suitable replacement mains lead, or if all else fails, you could always cut off the UK plug and fit a US or european one.

------------------
Willum