The best advice we have received about living in the UK is "Don't compare the costs here with US costs", but it is so difficult not to – especially given the simplicity of the current exchange rate (2 US dollars for every British pound). Here are a few examples of UK expenses (I've already adjusted the prices to US equivalency):
Filling up Jon's car $100
Gallon of gas (petrol) $8
Mandatory TV License which gives us permission to watch 5 BBC (like PBS) channels $273
Tickets to Windsor Castle $73
Pass to local model village with play park (only park within walking distance) $216 (bekonscot.com)
Haircut $50 (No Supercuts here)
Tickets for London Eye for two adults and one child (under 5s are free) $112
Day pass for train/bus ride to and around London for 3 (under 5s are free) $58
Meal for 4 with water at Wagamama (our new favorite "inexpensive" restaurant) $70
Average price for a simple 4 bedroom/2 bathroom house in Beaconsfield $1,750,000
Borrow a movie from library $4
Rent a movie from Blockbuster $8
2 Adult tickets at cinema $32
Bananas $2/lb.
Milk $4.50/gal.
Doz. eggs $4 (all free range and "respectful", and a few feathers included)
Happy Meal from McDonalds $6
Tickets for 4 to see Mary Poppins the Musical $246
Mail local letter 48¢
Letter to America 96¢
One-way flight to Rome for family of 5 $30 (Thank goodness for cheap airlines here)
Large pepperoni pizza from Domino's $28
Babysitter $12/hour
Rent an MPV (van) for 1 week $1300
P.S. Don't let this scare you into not coming out for a visit. Our guest bedroom is bigger than most hotel rooms and it has its own bathroom (which not every hotel can boast)--and it's free!