Any numismatists on TZ? Some advice please!

I have inherited a few coins that my father had collected. They were sourced from site called Westminster Coins.

Not wishing to be unkind to my Dad, but, they appear to be ‘tat’ to be honest. I feel he was under the impression that they might be worth some money in the future and unfortunate got lured into their subscription plan. I think they sold him one shiny coin at a cheap price and by doing so he unwittingly signed up for the rest of the series at a higher price!

The certificate that comes with the coins suggests that they are 925/1000 silver. Some come with a gold plate over the top and others have a ‘coloured’ picture on one side – one series of 12 of Queen Elizabeth and the other 12 of WW2 fighter planes.

I’ve managed to sell a couple on eBay but it doesn’t seem to worth the trouble.

Is there a better way to try and sell them? Are they the sort of thing I could sell for scrap at the going rate or, as I suspect, the bullion dealers wouldn’t want?