I also drove a coach from London to India in 1968 and as Bondi did, went on to Australia from Delhi. The vehicle was a 1948 Maudsley with a Leyland engine and a four speed crash box and vacuum brakes. In those days almost 2000 (in total) miles of dirt road had to be covered of the whole distance, starting after Skopye in Yugoslavia and on and off through northern Greece, Turkey and Iran.
Afghanistan roads were concrete to Kandahar then tarmac to the Pakistan border and from there to Delhi. I did this on and off until 1977, by then all the dirt roads had been gradually upgraded and it got easier every year. In the early 70’s the international truck traffic picked up a lot, Asian Transport (Astran) artics and drawbars were to be seen, I remember one of their drivers who was coming back from Lahore, Pakistan after delivering personal property for a British Consular Official to the Embassy out there. That was the furthest I ever heard of them going to.
In the 70’s another company who did a lot was ICC (Iran Container Company), they ran Macks, double manned from Tehran to Germany and back and hardly ever stopped. The trailers had belly tanks from the leading axle to the landing legs, not surprising when diesel in Iran used to be about 13 or 14 gallons for a quid. A couple of other Iranian firms were Marand and Shams Express, they both ran up to eastern Europe.
Technically it has never been easier to drive from the UK to India but all the road improvements have been negated by international politics. The fastest I ever did the trip was late 1971, Delhi to London, in 27 days in a 1959 AEC Reliance bus, with no co-driver.
Somebody has asked the question “Who on earth would want to drive to India?”. If somebody else said to me, “Would you like to go back and do it all again?” then there would no hesitation about taking up the offer. Driving a lorry here is hardly an adventure, I would rather queue at an Asian border now and again rather than UK distribution centres or docks every day.
This is not a trip for someone who has domestic shackles, or who expects to make financial gain in these times. The weather in winter is hard to believe after the mild British climate. Apart from the summer heat the real killer is a Turkish/Iranian winter, when it can drop to -40C in the mountains at well over 7000 feet and all the usual problems that come with that, like fitting and using snowchains, freezing fuel and so on. There were times when the engine was left running all night, otherwise the whole lot froze solid, let alone the diesel.
But don’t be put off by all this, do one trip if possible and report back.