The back end reminds me of a Leyland Titan (the B15 version). Was on one of London United's Omnicity's recently, from Fulwell as it happens. To be fair the bus was only about a month or so old so no rattles, but the air cooling system for the top deck was deafening. There's currently a batch of brand new Omnicity's siting in the forecourt of Fulwell garage being prepared for service