Yes, Barnes normally ask for your keys and park your car for you and then get it out when you return. The reason is they have very limited space, so they park the cars up tightly end to end. They do have some "normal" spaces on the right as you approach though, next to their marina. On my last hire, they directed my daughter to park there on the basis she was leaving midweek. Hopefully, if you phone and explain your situation they'll be able to accommodate.