First of all Hello to everyone here and thanks for all the useful tips on this site. I've been using this site for a year and a half now and this is the first time I've actually needed to post anything as I've always found the answers I've needed.
Anyway my problem at the moment is that i have and oil leak from the top pipe on the left hand side of the oil filter. I've circled it in red in the picture.

Can anyone send me in the right direction to fix it myself.
Thanks in advance for any help.