Tax on disposal of inherited shares

Hi, I'm looking for some advice regarding captial gains tax liability.
I inherited ordinary shares in a public company back in the 80's from a family member, and would like to dispose of them now. The company has issued a few bonus issues during this period so now my holding is now 3 times my initial inheritance. How is the CGT calculated on this?

Assuming that you dispose of all the shares, then the capital gain will be

Net value of sale (ie after broker commission) minus value at date of inheritence indexed up using the indexation table from the revenue site.

The taxable gain = capital gain minus € 1,270 assuming you have no other capital gains/losses.

Tax is 20% payable by 31st Oct if you sell before 30th Sep or by 31st Jan

The fact that the company issued bonus shares is of no effect - assuming they were gratis and not right issues.

Thanks jpd.