I use the same system martin and it work great for me, on average I am still owed about £150 but this comes in on the next month, so no real big deal.
yeah i only have around £40 odd a week to collect in, commercial work bills are getting really bad tho!
big pub chain!, big furniture company and a local community centre owe me over £1k from last month.
Martin this is what I do with commercial, at the start I state that my terms are 28 days, but I always send the invoice to the company 2 weeks before I have cleaned them, that way I only wait 2 weeks.
With others I telephone the account dept and find out who deals with my invoices, I then get them to agree to me faxing my invoice directly to him/her.
I do a major pub chain and when I am due to clean the pub, normally on a friday I get the manager to sign and print his name on the invoice, I then fax this to the accounts dept and telephone the account dept to make sure she has recieved it, if I do this before the tuesday then my money is in the bank by friday.
I have also worked it so they have already paid me 1 invoice in advance, which is even better.
I have only had one company who on purpose delayed paying (company policy) so I just sent them another invoice with a £40 late penalty charge and the following on the bottom of the invoice.
As you may be aware, under the Late Payment of Commercial Debts (Interest) Act 1998 we have a statutory right to charge interest on overdue payments. The current rate of interest is 0.5%. plus 8%. We also have a statutory right to charge compensation of between £40 and £100 towards our collection costs.
This worked a treat, they now pay on time.