A small update on the tools I've used. The wheel bearings required opening out – the cast holes being undersize to suit a variety of options of wheel bearing – so I made a purchase of a small set of drill bits. I already had the pin vice.

My largest small size drill bit was 1.5mm and my smallest standard sized bit is 4mm so this set fill some of that gap. A reasonable price of £7 for the set of seven drills from my local independent DIY shop. By coincidence, Heywoods wheel bearings fit quite snugly in a 2.4mm hole, which is one of the bits in the set.