Finally...
finished a long-suffering paper for Uni this arv and handed it in, went to an old local pub of mine for recovery and dinner, many pints with mates, great music... even laughed off an old fella (drunk and spilling his beer) who tried to pick a fight
came back and put the long charged battery in- (bearing in mind that my newly rebuilt starter has been waiting for 3 days now for the battery)
gave it a glow for 30 seconds- cranked, second revolution it fired... SWEET.... no problems.
The engine ran as I have only seen it run so far- Beautiful! no smoke whatsoever at start or anytime after. Exhaust is fume, clean and clear.
Then, I took it for about ten blockies (laps around my neighbourhood) up and down hills, exploring the gearing, slow, fast, low range and high, at ranges of revs...
So far so good- apart from one odd thing.
Bunnyhopping
in gear at idle it will crawl away, down a hill, up a hill, dack, dack, dack, dack(LOVE that diesel

)... whatever.
Give a teeny bit of throttle and it is OK... give it a tiny bit more (ie about 1/5th throttle) and it easily begins to violently bunnyhop.
Above about 1/4 throttle, then it is fine again...
This isn't just a first gear thing- it can freely happen up to 3rd (might happen in fourth, just haven't been to that rev enough yet in fourth).
Once it hops, dropping the throttle doesn't really help escape it (I have to engage the clutch to confidently get out of it)- while of course flooring the throttle out of the hopping range does help... after a couple of almighty hops

... not exactly the best solution.
I've driven manuals all my life- and am familiar with the occasional initial brief bunnyhopping when one is unfamiliar with an odd car... but this seems out of the ordinary (unless I am just a kook).
My girlfriend (who was in the passenger seat

) reckoned her old peugeot did that when the fuel filter needed changing...
The oil filter has just been done, the oil changed a few days ago, the air filter about to be done, and I was about to do the fuel filter as well- so I will soon see if this helps the problem.
But, any other ideas?
Is this just me adjusting to a new truck?
Does the BJ42, or 3B, or H41, have a tendency to bunnyhop at just above idle?
what gets me is that it crawls nicely at the flat-bottom-revs, and then at the slightly higher revs (that I would going in and out of when wheeling through tricky bits) it starts to bunnyhop
Hopefully I can just get an off the rack fuel filter tomorrow and not have to order one in. Hopefully it does something.
- and thanks for the reply Philclmp- yep, taken delivery, and aside from a few scares, I am very happy with it. Whatever the case, it will be on the road soon- and soon after off the road

I will hopefully be going round to a mates house this weekend to try to fix my window winder. He is a bit of a tech metalwoker- jewlery and metal-art- so we should be able to make something up with my windo system that works.
Anyway,
just an update-
I may have to pose the bunnyhopping question in another thread...
dunno.