It is pointless submitting TE9s until the debt is registered. When they register it, the amount on the CC goes up by £10 being the registration fee, so when you can see the amount owing on their website has gone up by £10, you can submit a TE9. You should also get an Order for Recovery in the post too. There is only a fixed time allowed for TE9 submission, from the date the debt is registered. I think it is 21 days, but I'm not sure.