An update: ordered 1gb of ram (max my system can run) at the weekend, and it arrived today. Took longer to find a screwdriver than it did to install the new ram. So much faster, actually works properly now, rather than just hanging all the time. Might not be the newest or fastest system around, but for what I am doing, and with what I was used to, definitely all I need for the moment.
And to think, I was going to do this a year ago but was told by a local electronics department store they could install it for me, but I would have to try to source the ram myself as it was no longer available and ebay would be my best bet for some second hand ram...