I'm due to return to work in July but I'm planning to leave and go freelance instead. I'm only getting SMP which has now run out so I'm only hanging on for my accrued holiday which I'll be able to take as a lump sum. As a matter of courtesy I think it's polite to tell them my plans in plenty of time so they can find a replacement but if I hand in my notice earlier than my required one month notice period, will they be able to ask for my company car back sooner? Or is it my best interest not to tell them until the last possible moment, which will make things awkward for them? Now I've made the decision not to go back I don't want to string them along but I don't want to shoot myself in the foot at the same time.