Mechanics of paying / calculating CGT when gain declared as part of an online self-assessment return ?

[EF101]

I am submitting an online self-assessment form for 2015-16 which, for the first time, includes a CGT return in respect of a gain of around £60k on a property disposal in January 2016.

I have completed the online form, including the CGT section, but am finding that the tax calculation shown ignores the CGT liability and only covers the income tax liability (actually a credit is dues on that).

If I have understood correctly the CGT is due by 31 Jan 2017, but I am not sure how much to pay, or how to pay it if the amount is not included in the self-assessment total.

Any help appreciated !

[EF101]

PLEASE IGNORE - POSTED IN ERROR !