The plastic 'Swoppet' knights were my favourite; the parts were all interchangeable... swords came out of scabbards, visors could be up or down. The one below is my own... I kept them all because they were prized possessions.
They were relatively expensive even when I was a kid, so I'd either get one knight on foot with my weekly 2/6d pocket money, or save it for 2 weeks and get a mounted one for 5/- (five shillings)
I also have the two siege machines shown in the catalogue page, but I bought these not long after I got married when I came across them at a toy-fair, because my own had disappeared somewhere over the years