Tax Info

Congratulations to all holders happy with the T/O offer.
Myself, I will come out well and truly in the green. However this is my first T/O and I'm unsure of my tax liabilities.
I purchased some of my holding well over 12 months ago but I also added to my holding on the 23rd May 2017 and more late last year
How will my CGT be affected on shares bought within 12months of the T/O being finalised?
I don't expect and answer here, but if someone could give a link to where I can find these answers I'd appreciated it.
Again, Congratulations or condolences to all holders, depending on your side of the fence