You could try Bar Estacion english run near the railway station in L'Ampolla for your english fix of fish chips and mushy peas only on friday nights though, but you can get  a selection of english style food and pizzas I suppose

If you want to try the local fare paella and Tapas there is a nice restaurant on the roundabout at the fishing port end of L'Ampolla Bar Fermin 11 from memory they also do Pizzas  not sure about burgers but one of the tapas is Cod in Batter with a side order of fries you might get away with it but no mushy peas I'm Afraid  Location:-) http://www.ampolla.org/eng/pop_planol.asp?tp=2&id=29