Below is a selection of rides in Sussex. Each ride has a start/end selected to ensure (hopefully) that there’s one near you. If not though you can always download the route and then tweak it to suit. I think. Safe riding.
Littlehampton – Haslemere – Littlehampton
Worthing – Pease Pottage – Worthing
Uckfield – Eastbourne – Uckfield