Worcester I was told by both my mate who was a gas plumber and the gas plumber I use have gone downhill with their current range, and not worth the extra cost.
Ideal was my mates recommendation, but I ended up with a Vaillant.
And obviously, whatever you do, do not use British Gas. Goes without saying.
I've been installing for British gas for over 30years they provide a very good service of installing your new boiler.
They fit Worcester Bosch boilers but also valiant. The reason is reliability as they make more money if they don't have to keep going back to fix a faulty boiler. All there installers are fully trained ,gas safe registered and have full public liability insurance. All engineers have regular inspections and go on training courses for safety and updates. All waste produced is packed, sorted and taken away by DHL waste disposal. They have a 24hr call out service in case of any problem with any of your heating system after installation of a boiler.You cannot get a better service then with British Gas and Worcester Bosch boilers.
I have a ideal logic plus combi in my own home.Well I did get it for free