2013 greenline exhaust sensor woes

Hi,

My wife's 2013 Greenline has the flashing glowplug lamp / P242a exhaust temp sensor 3 issue mentioned elsewhere. 

I bought a brown plug sensor and out to the car I went.

First issue the clip on the bulkhead is not home to the brown plug, no sign of it! Where do I go looking?

Second issue the sensor on the exhaust (that looks like the brown one I've got) is fitted on the pipe under the cat/dpf not on the side as most seem to be, is this the one I'm to go after?

Third issue, assuming it is the one, how the h*** do you remove it? Some sort of offset socket? 

Thanks in advance, 

Nick