Thank you very much for all suggestions so far - very helpful. Here is my updated draft, with still some questions marks:
Day 1: Fly from Kuching to Siem Reap, hotel check-in, Pub Street, Night Market, Old Market, Wat Preah Prom Rath
Day 2: Angkor Wat (Small Circuit): Angkor Wat, Angkor Thom, Bayon, Ta Prohm, Banteay Kdei, Sras Srang
Day 3: Angkor Wat (Grand Circuit): Preah Khan, Neak Pean, Ta Som, East Mebon, Pre Rup + Banteay Srei + Cambodia Landmine Museum
Day 4: Angkor Wat: ?
Day 5: Phnom Krom Pagoda + Tonle Sap Lake / Kampong Phluk Floating Village
Day 6: Siem Reap to Phnom Penh. Either fly or boat (if by boat shall I stay the previous night at Tonle Sap Lake, where I believe the boat depart from?)
Day 7: Phnom Penh: AM: Killing Fields at Cheung Ek PM: Tuol Sleng Genocide Museum, Wat Phnom. Evening: wander along Sisowath Quay.
Day 8: Phnom Penh: Royal Palace, Silver Pagoda, Central Market, Russian market
Day 9: Kampot OR Chau Doc ? Which one for photography purposes?
Day 10: Kampot OR Chau Doc ? Which one for photography purposes?
Day 11: Mekong Delta - how to go there from previous location? sleep where? join a tour or do it independently?
Day 12: Mekong Delta - sleep where? join a tour or do it independently?
Day 13: Mekong Delta - sleep where? join a tour or do it independently?
Day 14: Ho Chi Minh City, Hotel Check-in, HCMC sightseeing: Dong Khoi Street, Notre Dame cathedral, The War Remnants Museum, Reunification Palace
Day 15: HCMC: Cu Chi village, Tay Ninh/Cao Dai cathedral
Day 16: fly to Bangkok and then London
How to go from PP to Kampot OR Chau Doc (bus? how many hours?) And then to Mekong Delta (bus? how many hours)? Where to stay in the Mekong Delta?
