It is very unusual for me to try 630m QRP WSPR at this time of year. Assuming things work, I might well give it a try this evening. 

The noise floor will be higher at this time of the year on MF and that might mask my QRPP signal. It's an experiment, so the worst is nobody spots me! 

I wonder if people have moved to different modes on 630m and I should try a different mode?

UPDATE 2030z:  Initial tests were not successful. It is probably something dead simple, so I shall try and find out what is wrong tomorrow.