shabbas I wasn't aware the micro would have anything to do with my net
It probably won't, in most cases. This is mainly incompetent headlline writers that make a habit of picking out what is usually the least-important bit of the advice and highlighting it, because they don't understand the technical details. They are more interested in writing a sensational headline than telling the true story. It's a different twist to "fake news" situation, but so often news sites write headlines that don't fully and truthfully represent the information under the headline.
But actually, did that "advice" come from ofcom, or has a BBC journalist invented it?
I note with interest that the BBC site doesn't provide a link to the original ofcom article. But it's presumably https://www.ofcom.org.uk/phones-telecoms-and-internet/advice-for-consumers/advice/improve-bb-speeds-at-home which was published 5 days earlier than the BBC article.
The ofcom page mentions most of the things stated in the BBC report -- with one exception. Nowhere does it mention microwaves. What it actually says is
Halogen lamps, dimmer switches, stereo or computer speakers, fairy lights, TVs and monitors have all been known to affect routers. Keep your router as far away as possible from other devices as well as those which operate wirelessly, such as cordless phones and baby monitors.
And yet according to the report:
"Did you know that microwave ovens can also reduce wi-fi signals?" Ofcom asks.
So, what have we here? BBC putting fake words into ofcom's mouth, or did ofcom actually say that but not think it was important enough to mention on its own web page?
It turns out that the quote did come from ofcom, as a search of ofcom's news releases prove:
Keep your router as far away as possible from other devices, and those which operate wirelessly. Cordless phones, baby monitors, halogen lamps, dimmer switches, stereos and computer speakers, TVs and monitors can all affect your wifi if they’re too close to your router. Did you know that microwave ovens can also reduce wifi signals? So don’t use the microwave when you’re making video calls, watching HD videos or doing something important online
So why isn't it in the public web page too?
Perhaps it was omitted from the public web page because of the way that the BBC wrote its headline in such a misleading way. Ofcom probably wanted people to concentrate on more important aspects of the advice and play down the specific reference to microwave cookers, which is merely one aspect of "other devices", any of which can be at least as bad and probably worse.
Either way, it's high time that "truth in journalism" meant that headlines reflect "the truth, the whole truth and nothing but the truth. Headlines should not sensationalise a small and insignificant part of a story while ignoring the bulk of it, which is what this one has done.