Думаю, это будет
SELECT j.code, j.description, j.weight, j.[pack size], j.ppb, j.[CP-UK], j.[CP-EU]
FROM(
SELECT c.code, p.description, p.weight, p.[pack size], p.ppb, p.[CP-UK], p.[CP-EU],
c.Category,c.Sub_Cat_1,c.Sub_Cat_2,p.active,c.Page,c.Page_Position
FROM [Catalogue Info] as c
LEFT JOIN [Product Information] as p on c.code = p.code
)j
LEFT JOIN [;database=C:\mypath\db.accdb;PWD=1234].tbl as pl on j.code = pl.product_code
WHERE j.Category = 'VIENNOISERIE'
AND j.Sub_Cat_1 = 'CROISSANTS'
AND j.Sub_Cat_2 = ''
AND j.active = true
ORDER BY j.Page ASC, j.Page_Position ASC;