Yes, I suppose it could be a 10Mbps hub.
Anyway, panic over. Having spent far too much of my life lying on the floor, trying various combinations, plugging, unplugging and constantly running speed tests, son says don't worry Dad, I can connect the PS wirelessly. Argh! Why didn't he say that before?
However, just in case that does not work, what do I need? There seem to be countless LB-LINK 5 Port Fast Ethernet Switch LAN Network Hub Wired RJ45 Splitter BL-S515 for less than a tenner delivered. That'll do the job?