I took it to a mechanic and he thinks it might be the cam chain is on max adjustment and would need engine taking to bits to replace it... which would cost more than the value of the bike (00 model with 64k on the clock).
Was thinking of getting myself a CBR600 and getting shot of it. Just spent £300 on getting forks replaces as well.
Will try oil change and filter too.
Its a slight hitting noise (clicking/ hitting metalic sound, no rattling). Happens whenever engine is running. Comes from the engine itself and goes with the pistons, in time. So with every piston thump, you get a metalic hit sound. Happens when stationary or moving. Problem appears to have got a bit worse with a few short rides... but may be just that i think its got worse. Its very noticable, but its not super loud.
oil was last changed about a year ago and it does about 26 miles every 5 days a week.