Please correct me if I'm wrong.
You have allocated 58 aircraft above including 1 x Titan A320 and 1 x Privilege B752. The JET2 fleet stands at a total of 58 airframes at the moment and 60 if you include the Titan and Privilege aircraft. G-JZHD, the new B738 is still to be allocated a base perhaps, which would account for one, so there would appear to be one aircraft that has not been allocated to a base from your list. Perhaps GLA is 6 x B738 + 1 x A320 but maybe you know better.