The closest airports to both the Church and The Grange are Heathrow (approx 18 miles), and London City Airport (approx 12 miles). If you're hiring a car, these are the airports to fly to, if possible.
If you need to hire a car, there are a number of cheaper car hire options such as easyCar, or CarHire3000, or alternatively, you could use a car hire search engine such as Vroomvroomvroom which searches a number of well-known car hire firms for you, to enable you to find a good deal.
easyBuses are by far the cheapest airport transfer option if you are travelling alone or as a couple. However, please note that these buses do not run from London Heathrow airport. You can pay your fare on the day but this is much more expensive. If you know the time your flight will arrive, you can pre-book your easyBus transfers very cheaply. You can book a single or a return, and buses run at least every 30 minutes, and often, far more frequently.
From Luton Airport or Stansted Airport to Baker Street in Central London, the single fare is between £6.00 - £8.00 payable online in advance, and can be as little as £2.00 if your arrival is earlier in the day, or in the evening.
From London Gatwick to Earls Court in Central London, the fares are even cheaper even though the journey is longer! Expect to pay less that £5.00 per person for this route.
It takes around 60 minutes, with 4 changes, to travel by tube from London Heathrow to Baker Street, Marylebone, Edgware Road (marriage venue) and other Central London tube stations.
It takes 90 minutes by tube, with 4 changes, to travel by tube from Northwood (reception venue) back to London Heathrow.
It takes around 40 minutes, with 2 or 3 changes, to travel by tube from London City Airport to Baker Street, Marylebone, Edgware Road (marriage venue) and other Central London tube stations.
It takes around 70 minutes, with 2 changes, to travel by tube from Northwood (reception venue) back to London City Airport.
Journey times by tube can be expected to be in the region of 90 minutes from Luton Airport, 2 hours from London Stansted airport and 2.5 hours from London Gatwick Airport.
Apart from easyBuses which are the cheapest transfers available,there are always various combinations of other airport buses and public transport buses that travel from the London airports into Central London.
For a return journey to Londond Heathrow airport from close to the Northwood area, there is number 140 Bus that travels from Harrow Bus Station to Heathrow Airport. This journey takes around an hour. Harrow Bus Station is a short distance from Northwood and that part of the journey can be done by bus, tube or taxi.