Hi,
The good news is since topping up with some quality 5w30 the noise has stopped, my 50 minute commute home with Windows open has proven that.
The oil pressure is also looking alot more healthy idling at just under 30psi and 60ish psi while driving gentle. (I'm still a bit scared to take the revs too high)
The annoying thing about it all is that it was serviced around 3 weeks back at in-n-out, I should have ran a mile when the guy behind the desk said "we don't usually get cars like that here" and the fact it was an into offer and cost me 20 quid ha. Think I'll get it another service soon, who knows what shite they put in.
Also thanks for all the posts and advice, I'm embarrassed I couldn't read the dipstick accurately so thanks for making me double check.