Breaking it down and selling as individual coins or small groups on
ebay would make you the most money, but will take a lot of time and effort.
Selling to a dealer is the quickest and easiest. £2 per kilo is fair for the copper as the vast majority of this is likely to be scrap metal. With the silver there is going to be a lot more value - you need to break down the silver into 3 sections: Pre 1920 will be 0.925 Silver, 1920 to 1946 will be 0.500 Silver and 1947 onward has no silver.
The 0.925, assuming it is in well worn condition, should get 30 to 40 times face value. Individual coins of scarce dates or top condition may make much more.
The 0.500 silver should make 15 to 20 times face. There are fewer good dates in this range, so even in top condition not going to make much more.
The non-silver drops back into the £2 per kilo range.
A fair dealer will talk you through all this and explain what is being offered for which, including which coins are worth more than scrap. (An unscrupulous dealer will try to get away with £2 per kilo across the board.)
The third alternative is to put the whole lot into auction. Bear in mind that it will be bought by dealers who will factor in their commission and you will then also pay seller's commission, so typically you will end up with about half market value.
Feel free to private message me if you would like to discuss offline.