TwoTone-7, they are asking for the expiry date of your licence. Since the IR is not a licence, it's a rating, they must mean the expiry date of your CPL. In the same section they also ask for the date of your last MEIR. This will then mean they then have all the information they need.
Anyway, I fear I am too late with this advice as the application procedure is now closed. Did the applications have to be received by noon?