The total amount for accommodation is calculated based on the room type (single or twin), zone chosen and meal plan (which then assigns a certain rate per week, so for example Single room, Zone 2, Self Catering would be £165 per week). There is a table of rates here : http://www.londonhomestays.com/Rates2012.pdf.
The code would then use the arrival and departure date to calculate the number of weeks, add a booking fee of £50 and output the total amount.
The form is located here: http://www.londonhomestays.com/book-homestay.htm
Any assistance would be very much appreciated!
Thanks in advance