Are there any storage sites nr Rayleigh in Essex?

Hi All,

Looking to buy our first van this year, but we don't really have room to keep it on the drive. Are there any storage sites locally that anyone knows of? Despite trawling the net and the phone directory, not much has turned up. Would it be pushing it to want some sort of facilities to clean it? We would like to find a home for it before we commit to buying. Can anyone let me know rough pricing for this area?
Thanks in advance..