Anywhere there is pollack mate. Use black ones and go out when its a clear sky (not overcast) they will see the silhouette against the moonlight. Never tried it myself but plenty of people do it with redgills etc so I don't see why jellys wouldn't work. You get nowt if you don't try

Probably better in the warmer months May onwards. Tynemouth Pier, end of Shields pier, Dunstanborough etc