Hi Leon, I have been reading the thread and in order to try and convince you of the period of the cap you have I have taken photos of one of my Pre WWII RAF Officer's caps. Things to note:
1. General configuration and stitching patters are all pre war style.
2. My cap is a bit older than yours as can be seen in the syle of cap badge. The badge field is in the shape of either an oval or tear drop. This style was removed from the RAF Publication "Dress Regulations for Officers of the Royal Air Force" in the 1930's and replaced by the current "cut out" style badge prior to WWII.
3. Although well used, the visor underside is black not green as usualy found on early caps. The visor on later styled RAF officer's caps is grey materiel and there is no rolled outer edge.
4. The depth of the leather sweat band is invariably deeper on pre 1953 caps.
5. The internal construction, the stitching and the general appearance on your cap is essentialy the same as mine. Ergo pre WWII.
May I respectfully suggest that all of the above, in conjunction with my own experience (I have over 2 1/2 thousand caps) tells me that you have, as I described above, a bloody good WWII RAF Officer's cap. With regard to the other comments made about this cap, everything I have said, other than the badge details, is only my opinion. Ergo, I am not trying to shoot anyone down, pardon the pun please. I hope that you find this interesting and informative.
Regards Michael R