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Hi Buenchico,
I have now tried all the suggestions re Tom's Guide with no success sadly. I did not find any option to "unmount" the SD card but I suspect I've done what amounts to the same thing. I went into settings>storage>SD Card and clicked on the three dots and selected Eject SD Card. The only think that had been on it was the Kindle App and I moved that first to internal storage.
I went into Settings>Apps>Goggle Play Store>Clear Cache and Clear Data, powered down the phone, restarted. I then opened Google Play Store, selected Ebay and as before it began downloading (29.04Mb). It reached 100% and began downloading (29.04Mb), but when it reached 29.04Mb it just carried on downloading to reach 135% and then came up with the error message that Google Play cannot download this app and gave error code 963. Needless to say this is driving us mad. At the moment it is just affecting Ebay and Amazon Kindle. No idea what to do next. The phone itself is working fine and I'm sure even John Lewis where it came from would not be able to help - as they'd say the phone isn't faulty, it's a software/third party problem. Right now it's our problem. The Ebay app is used alot so we really want to sort this. It can't be rocket science, but it seems like it is. I have a lot of patience, and never want to give up, but............this is testing me!!!!!! Can you or anyone on AB suggest other possible "fixes" please