Rattling noise just appears to be the T-piece & oil pressure gauges rattling about against the inlet plenium combined with the engine just being chain driven in general, so think that solves that one. Still not sure on the brakes as to what's up, will attempt to solve over the next few months.

Although having said that, I've been seriously thinking about getting rid of it before the end of the year to make room for a new car that I'll actually be able to drive around daily, plus with the sale of it then I won't have to get a loan for the new car.