Hiddo:
I had one this week. I straddled both lanes to make a tight left turn into a 1 way street with double parked cars on it. I had a wally in a badly modified fiesta weaving at the back of me. As I mad my final move right to turn left he shot up the inside of me then stopped and gave me the fingers [emoji23]. I just laughed at him and it seemed to make him more angry.Sent from my iPhone using Tapatalk
Blowing them a kiss seems to calm them down 
The difference between you and the knob in the car is you are a professional driver.
If/when I get horn blasts off knobs in cars when Iāve done nothing wrong, I just crack on safe in the knowledge that I know what Iām doing and why Iām doing it (as in your example) as Iām an experienced pro driver,.and that he clearly doesnāt and isnāt. 
Thatās about all there is to say about those type of situations.
Ah the horn blasters.
I do it slightly different, usually out the corner of your eye you can spot the annoyed noisy perisher (typically itāll be someone hurtling around a roundabout** at speeds likely to push the tyres off the rims, not a hope in hell any lorry could clear the way, invariably they will have no idea about road positioning or the use of indicators), at the sound of the persistent horn stop and make a great show of looking all around for the vehicle/person that must be in imminent danger to cause such a racket.
During this visual appraisal you never make eye contact with the antagonist and after a while once youāve established all is safe you give a shrug of your shoulders and resume normal progress.
** As an aside, if the highways designers stopped deliberately putting sight reducing foliage or fencing or whatever on sight lines around roundabouts etc half the problems we cause through the invariable slow pulling away would vanish altogether, because weād be able to time our approaches better and keep rolling, welcome bonus of reducing braking fuel consumption lower emissions etc.
That would mean those who uses the roads for what they were intended for for years on end making sensible suggestions that would then be acted on, er no shut up J itāll never catch on 
Juddian:
** As an aside, if the highways designers stopped deliberately putting sight reducing foliage or fencing or whatever on sight lines around roundabouts etc half the problems we cause through the invariable slow pulling away would vanish altogether, because weād be able to time our approaches better and keep rolling, welcome bonus of reducing braking fuel consumption lower emissions etc.
That would mean those who uses the roads for what they were intended for for years on end making sensible suggestions that would then be acted on, er no shut up J itāll never catch on
They design expensive roundabouts because they say they are more efficient at keeping traffic moving than a junction.Then they remove vision and install traffic lights to stop the traffic thereby turning it back into a junction.
Whatās next , did I stop ok at the traffic lights , I mean common surely weāre not at a stage where drivers have to ask did I turn right ok , itās not exactly a tricky manoeuvre is it , itās just the basics of driving
Actually itās more worrying that 9/10 lorry drivers took the op seriously !!!
On the very first day of my class 1 training the trainer told me āthe white lines are for the cars. HGVs use as much of the road as needed to get round safely. Better to split the lane than hit somethingā. Yes you will still get driver of the āGermanā cars squeezing down the side when they really donāt fit. And yes they will shout at you for blocking ātheir laneā. But this is why they often end up with the car wrapped round a lamppost a few miles up the road and why we get where we are going in one piece. I learnt very quickly that if you leave even the smallest space someone will try to use it. So if in doubt I split the lane. And as someone said previously, the Highway Code is very clear that drivers should give large vehicles plenty of room when turning. To answer the OP - yes you did right to use as much of the road as you needed to.