It is the drivers responsibility to purchase any equipment required for travelling abroad from the UK, that include mandatory equipment such as breathalysers etc.
We suggest the customer reviews the RAC website for information on what is legally required vs the optional equipment.https://www.rac.co.uk/drive/travel/driving-abroad
If however they are hiring at a European destination, then the legal requirement per country will be provided by Europcar (winter tyres in Germany from Oct - Apr, Breathalysers in France etc)
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