spark plug questions

[_kid_]

Regarding my previous thread 'strange xantia toady' im in the process of changing sparks and fuel filter.

Ive finally removed what seemed like the 'sealed for life' 6 screws for the coil pack off, now looking in there i require a long spark socket, im have the socket set, just need the deep tool, im going to gsf tomorrow, what should i be paying for the deep socket?

Secondly, i paid £2.94 per plug from gsf, they are part no N92722, why are they so expensive? (Relatively speaking for a plug)

Thirdly, as this is my first change which way do i unscrew the plug, from the engine


Many thanks