Tail spend items are low value, high volume. P. 132

The seven wastes (as defined by Taiichi Ohno) can be remembered as Tim Wood; transportation, inventory, motion, waiting, over-processing, over-production, defects. Some people add an S onto the end of Tim Wood to make Tim Woods (the s is for skills). In some modules of CIPS, they refer to 8 wastes and include skills, but in M6 they've only put the 7 on p.70.

Supplier development is time-consuming and resource-intensive so should only be done with strategic suppliers. P.14

Unrestricted is not a type of tender. The 5 types are; open, restricted, competitive with negotiation, competitive dialogue and innovative partnership (though this last one is very rare in the public sector). The five types are explained in detail on p.77

In a 'perfect competition' there are no barriers to entry or exit, and competition is at its highest possible level.
For more information on different types of market see p.40