what to use in the UK
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Hi, they are chopped Jalapenos which are available pretty much anywhere, Annaheims are also a very mild chilli and can be substituted with Jalapenos, Pablanos, same thing really.
I do understand they do have different flavo(u)rs but look for an eastern European grocer and they will have several mild chilli peppers which will give you a choice of alternatives.
Anaheim, jalapeno and poblano peppers are not the same thing, they all have varying levels of heat and taste vastly different.
Jalapenos are hot compared to a mild Anaheim or Hatch chili (same thing) a Poblano is widely used for chili rellenos, when dried it is called an Ancho chili and is ground or soaked and pureed for sauces.
Don't know where you are in relation to this chili farm, something I found through google search.
Or this on Amazon.