Would like to thank green pro and others who have posted on this topic before, as I used a variation of letter you have put on the site. Customer owed for two cleans. Repeated emails asking for payment were ignored. At 7pm tonight I sent an email. Hi Mrs ## after several attempts to collect the outstanding balance of £24 for window cleaning and receiveing no reply at all. We are now adding a £40 administration charge to the account. This will then be sent to small claims court witch could incur more fees. Just got email back. No apology just check bank account money sent. It is literally ten minutes before email. Thanks again to those whos advice I used. First time I have had to do this an it worked brilliantly.