Client = a Plc that I've done work for over the last 8 years.
I have a couple of invoices in with them right now, the main one is for £16k of which £4k is mine (rest is VAT and cost of hardware which I'm being chased for now).
It was due on 7th December so 5 weeks overdue. I have left phone messages and emails requesting payment, with the last one being a week ago giving them 7 days before further action without notice.
I'm not worried that I'm not going to be paid, but I need the money right now and don't want to dip into savings. I don't want to risk future work either.
So, before I do something that may come back to bite me, should I just leave it or send them an invoice for the interest and compensation that the law says I'm entitled to (about £250 so far)?