Re: Done commercially all the time...
'Good job' depends what they were seeking.
Further sales I'm assuming, but how many TVs were they expecting you to buy?
I get the same issues with Amazon. They know who I am they have my order history, why do they keep recommending things I've already bought?
a) If I've bought one before I clearly don't need it's existence brought to my attention.
b) Most items are not the kind of thing you buy more than one of.
I don't expect GCHQ to be any more intelligent without human oversight.