I've recently noticed a ticking noise coming from the back of my engine. It seems to be as if under the plenum, it's not loud, but wasn't there before so obviously want to find out if anything is wrong. I've done a search and there are a number of threads with similar noises, but there doesn't seem to be one solution as you'd expect from a quick diagnosis over the internet.
The noise increases in line with engine revs and is there when the engine is hot or cold. Oil pressure and temperature appear to be normal. My car was serviced in December with oil and plugs supplied by ZMANALEX, so I don't think it is related. I also check the oil regularly and top up when needed, but the oil level has never been really low.
I've checked the fuel regulator pipe, but the noise doesn't seem to be coming from that area and there is no noticeable pulsing. There are no engine warning lights or any other issues / noises when driving.
Video below, any advice greatly appreciated.