I have just had a new combi boiler fitted, removing the old tank etc.
My plumbing bsuggested that I should change the Washiung machine to
run only off the cold water supply (T the cold pipe, cap the hot), to
avoid the bolier cycling every time the wasing machine wanted water,
and potentially interfering with the heat balance in the shower etc.

I am not sure I can see the point of this. I would prefer to have the
WM use the cheaper gas heated water rather than use its own
electrically heated from cold source.

There is a thermostatic valve on the shower, so scalding should not be
an issue (I hope)
And the WM is only used when we are in the house, so any issue of
wasted hot water in the pipe network is moot (we are just as likely to
be using the hot taps at similar times)

I read over some old posts, and there was nothing definitive about
this.

Advice? Opinions?

Neal