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In TSPS the data is aggregated, if you want access to the "raw" data - default 3 days then you need to use the TSIM API
I was barking up the wrong tree - now using the TSIM API I'm nearly there.
(However I kind of have the opposite problem - I'm getting granular data, but every second data point seems to be a value of "-1". I'm not sure why but I can handle it)
Michael Ashall thanks very much for your help.