30kva seems very big, I've been to building sites which have used smaller generators than this. At this size make sure it is super silenced, otherwise you might be suprised by the noice.
What about hiring a unit at Le Mans, there are some hire companies down there, one that i remember is Loxam, they hire access platforms and general plant. The only problem is the cost - hire, transport, insurance. Anybody work for Loxam or HSS in the UK?