My! I've finally received an email reply from Nestle, which is somewhat short of acceptable. It's nothing less than I expected - a standard reply suggesting that they will send me a cheque to partially recover my original outlay (no actual figure given).
I will not reply in haste but will send a considered reply next week to the Chief Executive.
There are all the issues that I wanted an answer to, none of which have been fulfilled.
* why didn't they put notification on the tin?
* why were they not in the tin as a bonus?
* why were so many 'regular' flavours missing? 
* trading standards/sale of goods act issues etc.

Just been onto their website to make sure that I don't buy any of their other products in the future, of which there are very many!  Just got  my workplace to change their regular order of coffee for a brand that is not Nestle -I'm spreading the word!