"3.1.24 The health economics model assumes that people who receive adrenaline auto-injectors will be allocated two epinephrine pens (EpiPens) with an average shelf-life of 6 months. Each auto-inject EpiPen costs the NHS £28.77 (British national formulary 60). This equates to £115.08 per person per year."

https://www.nice.org.uk/guidance/cg116/resources/costing-rep...

From 2011 - but I can't imagine the cost has gone up by that much.