OT heating flush- recovering money from installer?

[BigWallop]

June 07 I had a condensing combi fitted, on the quote it included flushing
and adding inhibitor with a workmanship warranty and 2 year warranty on

the

boiler. Im now told by the manufacturer after a recent repair visit that

the

system requires further flushing or power flushing. I have approached the
installer who tells me his warranty on workmanship is only 12 months and

as

I missed my 12 month service any further work will be chargeable.
Where do I stand on this, can I get another company in and possibly

recover

the cost from the original installer?

This question might be better answered in <free.uk.legal.public-law> so I am
going to cross post it to there and set follow up repliess to both groups.
Hopefully someone will come back with an answer.

X-Post and follow ups set to <free.uk.diy.home> and
<free.uk.legal.public-law>

[J Gibbons]

Try http://www.diynot.com/forums/