My friend needs a new combi boiler - his old one has given up. Knowing I'd been seeking advice here recently due to my own boiler problems, he raised the question whether it's likely to be cheaper to buy the boiler/flue/timer via the 'net and get an installer to install OR get the installer to organise it all? For example, you can spend hours researching the 'net to get the best price whereas the installer might just go to his local place (and dare I say it, add a couple of quid on himself). He's been looking at the Worcester 28i Junior condensing combi + flue for £830 delivered. Does the price & product seem okay/reasonable?