Maybe you haven't explained the situation too well, but I can never think of a time where a car has been able to accelerate up the to match my overtaking speed and "fill" the space where I wanted to go
An overtake should be performed quickly (the more time you spend on the other side of the road, the more dangerous your situation).
If you were on a 125 then you should either build your speed up and ensure that you have a healthy speed to overtake, or as mentioned before, ride to survive and back off if the guy looks like he's gonna be a cock end.
If you were on anything with a half decent engine, you should slap yourself for not overtaking properly and leaving the door open for the guy to be a cock.
Sorry if the above sounds harsh, but I read "I overtook fairly slowly, stayed in the middle of the road, slowed down a bit to see where my mates were and ended up with a car undertaking".
What I would have not read was "I checked for the overtake, dispatched of it quickly, returned to a commanding road position and carried on with my journey". The reason I wouldn't have read that is because it wouldn't be worth writing as nothing really happened other than an overtake
Glad you got all upset. Great idea to park the bike in front of him and approach in a threatening manner too. I'd think it just about gives him a decent excuse to knock your bike out of the way in self defence






