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I have a feeling there was some volume based legislation that went EU wide around 2013/4 for a lot of devices, certainly mobiles phones & music players went down a fair chunk

If I remember right from a colleague at work what you need to look for is an amplified phone marketed as for sever hearing loss

(or trawl ebay for used freestyle 750s https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=+BT+Freestyle+750&_sacat=0 which may be easiest, especially if he's getting a touch forgetful as he may never get used to using something different)