The first work experience placement is primarily to do with experience what it is like to have a job: dress code, part of a team with adults/strangers, travelling to and from place of work, following instructions, general public etc.. It is the second work experience placement in sixth form where they benefit from being somewhere relevant to what they wish to do in life, so do not worry about where. Lots of students go back to their old primary school for the first placement. My son went and helped out at Southwark Food Bank. If he likes animals, why not try Battersea Dogs Home with experience in the office as well as with the animals?