[bwdbrn1]

Hi, and welcome to our group. Not at all familiar with Flymos myself, but looking at their web page, I'm guessing that the part is no longer available because that particular model has been discontinued. When you say it's broken, is it the case, or the switch within the case that is broken? Might it be possible that a switch from another in their product line would work as a replacement for yours?

 

[bwdbrn1]

There's probably a hundred different ways you could "bypass" the switch, but then, in the name of safety, I wouldn't want to try, or recommend that someone else do so.

From the parts diagram, it does look like the box is a contraption that sort of clamps to the handle, and other models of their mowers have boxes that attach in similar fashion, so that's why I wonder if another mower's switch box might work.

Have you tried these folks?

http://www.sparesgiant.com/m-178-flymo.aspx?pagenum=10

They show a huge number of Flymo parts, including the one you are looking for. It shows the price to be £0.00. I don't know what that means because every item I opened said the same thing. Worth a try though.