how about tidying with
INSERT INTO tblForCSV_main (OrderNo, ProductCode, Qty)
SELECT
Replace(Mid([RawData], InStr([RawData], "Booking Ref:") + 12, 12), ' ', '') AS BookingRef,
Mid([RawData], InStr([RawData], "Pallets") + 21, 13) AS HSProductCode,
Mid([RawData], InStr([RawData]...