Thank you for the lead for IDing 'my' Mystery #126 set, Angela.
As you say, the lidded pot is indeed pattern 570 on page 28, and the candlesticks are pattern 350 on page 22, but I can't find a match for the tray yet - could easily be a mismatch I suppose, especially as all the pieces are in clear glass.
I will add ID notes to the comments section on the Mystery #126 section of Anne's GTS site shortly.
Fred.