I'm not disagreeing with you, but worth noting that the Government of Scotland is formed by the SNP, not the Labour Party.
It's possible that the SNP have different attitudes, which they would bring with them into independence, but they have not taken a public stand on the issue, and of course they have no track record either way because the devolved government does not have power in that area.
http://www.scotsman.com/news/gchq-fears-call-for-assurances-...
[NB I am not an SNP supporter, although I am in favour of Scottish independence]
If a politician actually wanted something to change, I think they'd write a more focussed letter, with actual demands for things to change - eg how long data should be stored, independent inquiries, codified powers, public reporting of statistics on surveillance, etc.