So the kit was working after all. IU1DZZ (973km) has been spotting me over lunchtime quite well by Es. No other Es spots received yet on 10m WSPR.
On 10m WSPR I am 100% TX (frequency randomised every 2 mins) but on 6m WSPR I am looking 80% of the time on RX and sending all spots to WSPRnet.
UPDATE 1315z: F1TZG (876km) is also spotting my 500mW 10m WSPR beacon. 10m is livening up now. He was also spotted on 6m WSPR much earlier in the day.
UPDATE 2140z: Well there has been 10m Es on WSPR just about all day. This must rank as one of the best days for 10m Es all summer.