First job, sand the entire lot, fill the cracks with timber putty and a heap of no more gaps. Then, undercoat the lot and paint the whole lot white. I will take lots more photos along the way as this is a mammoth task and will take a few weeks to complete. As my hubby said last night while I was painting and watching Revenge... we can just plug away at it.
Might need a truckload of Museli Slice.