Lot of 52 First Day Covers - 7th series - most of them difficult to get

Lot of 52 First Day Covers - 7th series - most of them difficult to get 

The numbers of the FDC's are as follows:

7.00, 7.01, 7.04, 7.05, 7.06, 7.07, 7.08, 7.8, 7.9, 7.10;
7.11, 7.12, 7.13, 7.14, 7.15, 7.19, 7.20;
7.22, 7.23, 7.24, 7.25, 7.26, 7.27, 7.29, 7.30;
7.31, 7.32, 7.33, 7.34;
7.42, 7.49, 7.50;
7.51, 7.54, 7.57, 7.60;
7.61, 7.62, 7.63, 7.64, 7.65, 7.66;
7.71, 7.72, 7.73, 7.74;
7.91, 7.92, 7.93, 7.94, 7.95, 7.100;
7.142, 7.146.