Apparently they arranged a 5 star Tunis hotel, flights and meals, for under the £660 above which the trip to the wreath ceremony where he didn't lay a wreath (if you ask him in May 2017) but did (if you ask him in August 2018) would have to be declared.
I am a member of many travel reward schemes but sadly not one of them offers such amazing deals.
Of course, the alternative (that he's a dishonest toerag who has now been caught and is wriggling on the hook) is not possible. After all, Mr Corbyn is a Nice Old Man; he can't help it if he forgets?
I wonder if he flew economy?