I did a little bit of tidying up and tried it as follows :-
SELECT tabHSE.id, tabHSE.title, tabHSE.location, tabHSE.inspectionDate, getReviewDate(tabHSE.inspectionDate,riskFactor*likelyhoodFactor) AS calcReviewDate, tabHSE.type, tabHSE.status, tabHSE.riskFactor, tabHSE.LikelyhoodFactor
FROM...