Thanks David. It supposed to make more of the intake air pass through the radiator rather than go around it. I've seen some user feed back that it also contributes some down force. I'll post pictures when I fit it.
Travel restrictions still apply in Scotland so I've been working (slowly) through a long list of jobs on the F. Number 1 plug socket was filling with oil so the cam cover gasket was obviously suspect and by luck a friend offered me a polished cam cover so that was the incentive I needed to change the gasket. I do prefer the look of the polished cover, however hidden it is, but the added bonus was that the old cover had a stripped thread for one of the coil bolts while the 'new' one is perfect. No wonder there was oil in #1 - there was a chink of gasket missing.