What world are you in gremlin16, cause it can't be the heating world. You must clearly work for Rehema or have some sort of deal going with them.
Worcester Bosch (Okay and Vaillant) are by far the most reliable boilers on the market. Their build quality is excellent. The Greenstar range has been around for 5 years now and as for them breaking down its pretty much unheard of....considering this is the most installed boiler in the UK, there is a reason for this as installers know they won't get any come back.
As for Rehema I don't know much about them, but you can't put out a statement that WB reliablity is long gone as its simply bull.
Fortunately I agree with Gremlin and it would seem most of the others as well.
WB are crap when compared to Broag.