Gasket is around 3 quid from any good auto parts place or flea bay
Get the slam cover off, radiator fan out. Airbox off
Battery cable off
Take the aux belt off 16mm on tensioner
2x 13mm bolts holding the tensioner
2x 16mm bolts holding the alternator, Unclip the plug and undo the 17mm bolt holding the battery terminal on the back- take the alternator off
Undo the 19mm bolt holding the oil line from the oil filter housing to the vanos unit
Undo the 6x13mm bolts holding the housing in place and remember where they go
Pop the housing off and replace