Already paid mine and have January's in the bank.
Ditto 
Teacher's pets!
I'm similar to Gold, but I pay by standing order, not direct debit. I can adjust my payments myself that way using interweb banking.
No just being prudent.
I recommend to startups that you only draw 50% of turnover and live off that. That way you always have money saved for Tax and emergencies.
That is pretty much the way I would do it but I would need to increase my turnover a fair bit for that to be possible. Unfortunately I always seem to be chasing the pound in order to service the debt from past mistakes (in my personal life rather than business life).
What I actually do is have BACS payments into a separate account. I did this because Santander stopped showing the references. Those BACS payments do cover the tax and NI. Unfortunately, I had to make a couple of draws on that money earlier in the year so it won't quite cover it this time.
I'm starting to lean towards Tosh or Gold's way of doing things but with a lower amount. The payments wouldn't cover the full bill but would take the most difficult bit off it. If, say, I were to BACS £100 - £150 a month to them that would make a decent dent in it.