after watching a few videos I have made the following alterations.
Changed the bus stop chicane exit, so tighter and added 2nd left apex before start finish straight.
Changed the downhill back section so is much faster and less severe direction change
Slightly changed the long 2nd left corner so is more apex/crest friendly.
Slightly changed the left out of the 1st uphill hairpin so now has wider radius
As ever, open to suggestions for improvement.