Help please with silver tea pot hallmarks

Hi there mum has moved into a small unit and it’s time to part with the goodies she’s had stored away. I just wanted to know if this set is EPN or is it silver, the age and the approx value to sell it for her.

Those are electroplate marks of John Round & Son of Sheffield and probably date from the very late 19th century. For a realistic value I suggest you look at Ebay’s “Sold” listings to find how much similar pieces have sold for - it won’t be very much unfortunately.