The following refers to work I carry out on a freelance basis.
I will normally invoice for payment on completion of work carried out.
Where projects stretch over four weeks I will invoice monthly in arrears or on completion of each stage, whichever is sooner.
Electronic transfer (BACS payment) is preferred.
Expenses will be charged at actual amounts and receipts will be provided as appropriate.
The UK's Pay on Time legislation exists to ensure businesses get paid in a timely way for work completed.
I abide by the late payment legislation when paying my suppliers, and I assume my clients will do the same.