I would always assume that precious metal coins and medallions have a some value over the direct silver content. How much obviously depends on how desirable the piece or set is.
Given the approx. weight you've given, it would have a spot price of about £1,350 today - just shy of £39 per medallion.
There's some listed on ebay as individual items at ~£60-£80 a piece (and someone trying to shift a set of them but without the display box for £1,800). HOWEVER, it is also worth noting that these are not sale prices, just asking prices and you can ask whatever you want - doesn't mean anyone will pay it. There doesn't seem to have been any sales of even individual coins recently on ebay. So, to me, that suggests these people are asking a bit too much for the collectors interested in it. But they wouldn't bother listing them if no-one was interested in them either. I would guess that it's a fairly niche market.
There are some easily viewable records from proper auction houses but they're 2013-19 so a bit out of date. It looks as though most of them have sold above the spot price of silver on the day. Some only just, some seemingly by a reasonable bit.
As such, I would say it does have some value more than it's pure metal content. But I'm afraid I can't tell you how much more.
