Electric shower leaking from the side, replace the PRD (easy diy fix)

All electric showers are fitted with some type of PRD, they are ALL designed to be replaced easily as they are a "one time use" safety device to prevent pressure buildup in the pump but some require more dismantling to gain access then others, this is a VERY easy DIY fix which requires no more then 2-3 screwdrivers and 5-15 minutes work and could save you a fortune in call out fees and wait times, I ordered direct from Triton UK and the total cost for 2 PRD's and a new hose with shipping within 48 hours was just over £30