Oil leak

Whilst cleaning my 2015 bonnie this morning I noticed a small amount of oil. Wiped it off and went for a ride, now a lot more oil there. Looks to be coming from where the nut and engine casing meet, it's the one with the braided hose. The nut seems to be tight, what does this hose do?

 

Everywhere seems dry and clean, even around the copper washer. Does appear to be the small well where (banjo?) goes into casing. Warranty more than 6 months to run but with all the mods that may not be keen, although it's only the o2, Sao and exhaust and remap, which I guess would have no bearing on this problem?

 

New oil feed pipe and washers needed under warranty, approval from triumph and parts take a week apparently. Really in this day an age!!

 

Well so far so good, I was told it was a week over the phone by a young lady who was pleasant and had a sense of humour, I asked her to give the bonnie a hug before she put her to bed!
As I was local I nipped in to see if there was any courtesy bikes going, the stern faced service manager said yes at £18 a day! I said if it's a thruxton R I will take it. No response, it's over there somewhere waving vaguely in the service area, I said is it that thruxton next to the bonnie. No he said, it does not matter how many times you say it it won't be a thruston R. Not even a glimmmer of a smile!
I was obviously annoying him as he said he will try to get my back to me by Friday. He was a sour puss when I dropped it off at 8am this morning and he did not lighten up by lunchtime, obviously he was having a bad day, maybe he caught his wife in bed with his neighbour but ffs you work in customer service try and be a little affable!!!
As long as the bikes sorted it's fine, just may be crack a smile even if the joke is crap!

 

Bike all back and fixed on warranty, took in on Tuesday morning & ready Thurs evening, pretty good service. They did call yesterday to say did I have a spare key as they lost it! It turned up so no great shakes, even had smiles & free coffee from the service team, no sign of Mr Grumpy, maybe they put him back in his box.