Is a power flush required if fitting a new boiler?

[LPC]

Just wanted to provide a quick update. Have had a second quote of approx £2k for the Worcester Greenstar 30si with thermostat, powerflush and filter (I think). He clearly loves Worcester and said the only other brand he would recommend was Valliant but as this doesn't come with a seven year warranty he thinks it's not as good a deal.

Very easy to become Vaillant Advance, then offer 7-year warranty on a Vaillant.

Worcesters are easier to fit than Vaillants and I bet he's got a Vaillant in his own house.