Ahead of the trip ensure an itinerary is worked out.
Ahead of the trip ensure there is a hair dryer and iron in the room is required.
Ahead of trip all inbound/outbound connections are understood.
Ahead of trip ensure inbound and outbound taxis or car-parking is organised.
Ahead of trip, ensure a buying list is created for shop/duty free/list/plane.
To ensure any last items are collected. (Though try to ensure these are collected in advance).
Ahead, if celebration planned while on holiday, ensure cards/gifts bought for trip.
Arrange an overseas mobile data/call packages.
Bank : Ahead of time inform bank/credit card company you are going overseas.
Bank : Cash For Taxi/Buses (including in and outbound).
Bank : Credit Card, more than one if possible.
Bank : Debit card, more than one if possible.
Bank : Emergency cash.
Bank : Foreign currency if required.
Bank : Gadgets : Required sometimes to log into online accounts.
Bank : Hold back local currency for departure taxes if required.
Bank : Money:belt
Bank : Remember list of passwords/details of bank sort codes (required if issues with credit cards).
Bank : Travel cheques (if applicable).
Bank : Wallet
Clothes : Accessories : Belts
Clothes : Accessories : Collar Stiffeners
Clothes : Accessories : Cufflinks
Clothes : Accessories : Jewellery and rings etc.
Clothes : Accessories : Reading Glasses and or Spare Glasses.
Clothes : Accessories : Scarf.
Clothes : Accessories : Sunglasses.
Clothes : Accessories : Sunhat.
Clothes : Accessories : Winter Hat
Clothes : Dressing Gown
Clothes : Fleece or coat.
Clothes : Flight Socks.
Clothes : Flip flops/deck shoes.
Clothes : Gaiters (If going walking).
Clothes : Gloves.
Clothes : Jacket/Blazer (if required).
Clothes : Jeans.
Clothes : Jumper/Pullover.
Clothes : Pyjama.
Clothes : Shirt (Long sleeve/Dress Shirt).
Clothes : Shoes (Smart).
Clothes : Shorts.
Clothes : Socks (Normal and sports).
Clothes : Suit (if required).
Clothes : Swimming shorts, trunks, sluggies.
Clothes : T-Shirts (Normal and smart).
Clothes : Tracksuit Trousers.
Clothes : Trainers.
Clothes : Trousers
Clothes : Underwear/Bra
Clothes : Underwear/Pants
Clothes : Walking Boots
Clothes : Waterproof Coat
Clothes : Waterproof Trousers
Cosmetics : Nail polish remover.
Cosmetics : Nail polish.
Electrics : Camera.
Electrics : Torch.
Electronics : Batteries (Camera/CD/Clock) and spares if required.
Electronics : Battery Charger.
Electronics : Clock (Alarm)
Electronics : Ipad/Tablet/Laptop.
Electronics : Phone : Batteries : Charge them if rechargeable, including phone.
Electronics : Phone : Mobile Phone.
Electronics : Travel Adapter.
General : Accessories : Watch
General : Address/Mobile number in baggage (Address of work place not house if possible).
General : Books/magazines for reading.
General : Business cards.
General : Check fire alarms on and working (ensure neighbour knows what to do in event).
General : Check house (inside and outside) plugs are out.
General : Check passport and visa are valid.
General : Clean up for when back inc. Bins and removal of perishables.
General : Clear Fridge of anything that will decay is fridge is being left turned on (not advised if possible and Fridge without used freezer compartment etc).
General : Close all internal doors and ensure smoke detectors primed.
General : Compass (if going walking).
General : Contact list (and send to email box).
General : Cut nails.
General : Cutlery (e.g. Plastic spares including small teaspoon).
General : DVD/playlist and film and music downloads.
General : Emergency numbers.
General : Ensure all windows closed.
General : Ensure any meetings scheduled whilst away are rescheduled.
General : Ensure any out of office messages set on work email system.
General : Ensure anything that can be affected by adverse weather (Sun, rain, wind) is secured.
e.g. Any external/internal water pipes lagged, stop tapped if leaving in cold weather, e.g. any trees/garden ornaments secured if going away in windy weather.
General : Ensure home looks occupied with darkness operated lights etc.
General : Favourite food and drink.
General : Find out duty free limits.
General : Flask.
General : Flight details to family.
General : Haircut/Grooming.
General : Heating : Turn down and to holiday cycle, i.e. not on all time, enough to keep house warm and importantly above zero if winter.
General : House keys.
General : Instant Coffee and/or Tea Creamer and Stirrer.
General : Layout going away clothes the day before.
General : Lock external doors/outbuildings/shed etc.
General : Maps.
General : Organise house sitter if required.
General : Overseas Car Insurance.
General : Overseas Medical Cards.
General : Pack Of Cards.
General : Padlocks.
General : Paper.
General : Passport.
General : Pen.
General : Photocopy Fights and keep separate to originals.
General : Photocopy, print and email yourself passport/Visas and keep separate to originals.
General : Place hotel details on a piece of paper to give to taxi driver if required.
General : Plan arrange trip to/from Airport.
General : Plastic bag for passport.
General : Plastic bag for rucksack.
General : Post any outstanding letters.
General : Provisions/Snacks (E.g. Sweets/Nuts/Chocolate).
Can also be useful for where you are stuck and no shop available. i.e. A plane not taking off on time, e.g. landing on a day where the shops are closed at your destination etc.