[ThomasG]

I know it wasn't intended, but I don't see myself as "bump on the log"

Reg14

2. Additional rules for motorways (275 to 278)

275
If your vehicle develops a problem, leave the motorway at the next exit or pull into a service area. If you cannot do so, you should:

...verge.

Never attempt to place a warning triangle on a motorway


do not put yourself in danger by attempting even simple repairs

ensure that passengers keep away from...

Source:


http://www.highwaycodeuk.co.uk/addit...motorways.html

Rule 274
If your vehicle breaks down, think first of all other road users and

put a warning triangle on the road at least 45 metres... ... but never use them on motorways

Source: (actually both quotations can be found here)

https://www.gov.uk/guidance/the-high...nts-274-to-287

So, just to clarify- by changing wheel on motorway you might be breaking law.
In addition, I was told not to by policeman.