Presumably in celebration of this year being the 45th anniversary of Whizzer and Chips, Egmont have published a 72 page hardback collecting old annual strips. However, The Best of Whizzer and Chips Annual is exclusive to Sainsbury's... and sadly not all branches are stocking it.
I'm not quite sure who these 'exclusive' arrangements benefit. Certainly not the potential readers who can't find copies in their local stores. Surely not the publishers, who must lose some sales from such limited distribution? Seems a win-win situation for the retailer to me.
There is also a similar book, The Best of the 70s Girls Comics Annual, and apparently one reprinting strips from Battle, but they are also restricted to the same 'exclusive' deal. The books are priced at a very reasonable £3.99 each. You may be fortunate if your local Sainsbury's is stocking them. Good luck!