Checked my prevous comments, and yes, the 1.8 is a revision on the Endura TDDI, and has a double chain driven fuel pump, and a belt driven camshaft..... Saying that, [u][b]UNLESS[/b][/u] the engine has not had regular oil and filter changes, at that mileage I would be very surprised if the chains had worn to be that slack, as the adjuster is hydraulic. More likely to be the heat shields, as stoney and artscot say. They do seem to have a habit of rusting though the bolt holes, mine did on the rear shield, as I thought this was causing my rattle, but it wasnt. Had to have the bolts pulled, and refitted.... no amount of penetrating fluid would touch them.
Always look for the simplest things first, as its usually them. On my old almera, had a rattle, that for the life of me could not trace, and it ended up being my sunglasses in the roof mounted sunglasses holder. Got no end of ribbing for that one