to reply, combatitively, to the first post:
silly boy, overtaking at 45mph, you should have been in 3rd. Always!

Overtaking in 4th (or 5th) with a small engine is never straightforward.
....unless it's a definate hill, then you want 2nd til 50mph for that teeny bit of extra zing. if it's the 4-speed of course.
(how do i divine that? thru too much experience of having to whip the ol' 45hp'er around too many people doing 45 on A-roads. Why is it almost always 45?)
(and from seeing a friend of a friend, in a 1-litre nova, 4-up with luggage, attempting to overtake a truck. in france. in what later was reported as 5th gear. at 40mph.... whilst we were sitting behind watching from a much quicker escort whose driver dared not risk the pass, crapping ourselves as to whether he'd make it before the bend about 2 miles ahead. the passengers said that they eventually screamed enough in unison for him to change gear for the first time ever. scary.)
sidaba, as regarding the second post, also had that happen, just around the corner from home... coming up a road that's only 2.5 cars wide, with people parked randomly one side and t'other, just sauntering up at about 20mph.... see another car blatting down in my direction, still out of harm's way, but no gaps in between, so gently pull in and brake to leave a space for them to come thru. then some prat in a red rover who'd been following on behind me decides this is their chance and starts to come past me fairly quick. I hadn't signalled, let off the brake pedal, come to a complete halt, pulled right to the curb, anything like that - just left the requisite 1.1 car gap, whilst being 0.4 the way out myself - but on they come. luckily i have half an eye on the mirror, lean on horn and just pull out ever so slightly (cant exactly "leap into the breach" with a small engined polo), hopefully enough to give them and the other car pause for thought without actually getting into danger myself. oncoming car slows quite a bit, driver of red car throws out the anchors, gives me a flash and a very dirty look.... before finding themselves face to face with another road user giving it back to them. and we do the automotive tango for a couple minutes much like three tractors at a passing place on a single track lane. like... duhh... learn to look more than 5 metres up the road or at the nearest car only, dumbass.
this town is filled with such dopes, i really dont get it. "back" in bangor at least the worst I had to deal with was hordes of confused people who somehow dont realise their car has lights, or that "LEFT TURN ONLY" and "NO ENTRY" apply to those who speak welsh as well as those who speak english. you can account for and handle such things... pure unadulterated crazy driving, there's just no defence against.