Scotland has 40,000 hectares of gardens. My own garden approx 1/100 of a hectare (30 x 30 metres) and is currently home to 10+ Peacocks.
Amendment 17th Septemeber. 12 just now on a white buddleia.
So that suggests very approximately 40 million garden Peacocks in Scotland.
Let's put some realism in that number and say that the total number of Peacocks in Scotland is probably in the range 4 million to 400 million. The human population of Scotland is approx 5.5 million. So it is more than likely that each human has his/her own Peacock.
Perhaps I should name ours 'Jack2' and 'Stella2'

Jack