"if they believe they have cause"
"By the way this is no different to your credit card, mobile phone, etc, all of which can be viewed by the Police and Security Services if they believe they have cause."
All men are equal, but some people can view Oyster records when they feel they have cause and others just think there should be judicial process behind it and evidence of a crime checked by a judge. Just like they have in EVERY OTHER FREEKING COUNTRY!
"Credit cards and alike are already monitored for suspicious transaction patterns by the banks, who I suspect, and hope, tip off the security services if they find anything really odd, like large purchases of fertilizer by private individuals who aren't farmers."
Yeh, we started down a slippery slope and now we've slipped further down, and people argue that it's OK because you slipped down some way already. Hey we've already undermined the privacy thing, so lets undermine it a little more.
"if you don't want your life monitored, then ditch your ...."
Or campaign for more privacy and judicial process.
"Personally if anyone from SISs wants to dig into my life good luck to them."
Why stop there, maybe you're not a terrorist but you a thief, so the police should be able to monitor you, or perhaps a puppy puncher? What about RSPCA getting that powers. Perhaps you do things that reduce others safety, ROSPA should get the power too, perhaps you undermine democracy so how about letting politicians have it too. Perhaps you will attack my network, so I'd like access to all that info on you. Maybe you will park in my parking place....