Buying PUT options

I have a question about buying PUT options. If I am holding a stock ABC(with gains) and then I purchase PUT options of the same stock, does this count as a disposal of stock ABC and therefore trigger CGT or will it trigger CGT by the time the options expire?

Hi,
The date of disposal for CGT purposes is the date on which a contract becomes unconditional.  
Please have a look at the guidance at Capital Gains Manual CG12301 - Options: put option or call option onwards.
Thank you.