If you know any fishermen then they should be able to catch you a European eel out of the river Thames easily enough, if you dont then i can catch one for you if you can collect it from the Twickenham area. It wont be a elver as these eat tiny microscopic foods but i can probably get you one around the 8" mark.
Or if you dont mind getting a bit dirty then you can probably go and catch one in a net by turning over large rocks along the river bank.
Or if you dont mind getting a bit dirty then you can probably go and catch one in a net by turning over large rocks along the river bank.