It seems that they wanted to keep a record as to whom, what, where and when.
Why wouldn't they know that from the usual methods? Based a/c info, G-INFO for the rest.
or even cost me a bob or two to get any internet (ie Europe)
Submitting a flight plan negates the need for a PPR slot.
does make me wonder if it is just a sly way of telling us all to find another airfield.
Yup.