Thanks all again for your time and trouble.
A quick update, I've reinstalled Windows 10, and this appears to have made things somewhat better. It now appears that the one major problem left is that the wifi appears to be terminal. If I'm lucky I'll get a couple of minutes of use, on a very weak signal, before it dies.
I've checked for updates on the wireless driver, and it is the current version, I've also uninstalled the driver. However when the driver is reinstalled it behaves exactly the same as the previous version.
I fear that this may be time to put it out of it's misery. Unless you know different !