The moment he made off after being stopped the first time, he upped the game and becomes a danger to others and potentially anything could happen.
I do see both sides to the discussion but I would still rather see the police deal with offenders quickly and sharply than stepping back for fear of public opinions.
Would you be saying the same thing if it was your father?
Now i'm not a copper (although my daughter is) and I wouldn't want to be one but if I was following the bloke in the Range Rover knowing how old he was from pulling him earlier I would of done a check with the PNC got his address and waited there for him there, simples 
Why do people always do that lol.
Would a PNC check have informed the following officer if the old chap had a gun and was suicidal? Had a kidnapped child in the car?
Perhaps a better outcome would have been that they let him continue driving in a distressed state and plough into a woman and child crossing the road and then pick him up at home. Would your liberal attitude still be apparent if it was your wife and child?
I am sure then the uproar would be "Well why the hell didn't they stop him sooner"
Why do people always do that lol.

Nice try Rufus but the following is just as speculative and emotive - and - just as redundant.
Perhaps a better outcome would have been that they let him continue driving in a distressed state and plough into a woman and child crossing the road and then pick him up at home. Would your liberal attitude still be apparent if it was your wife and child?
I am sure then the uproar would be "Well why the hell didn't they stop him sooner"
Quite so, but by lawful, proportionate means Rufus. I have been in many situations where I had the option to escalate things beyond a certain point, in most of them I was glad that I took the considered less direct approach.
Gung-ho policing leads to all manner of difficulties, I have been there and can say with certainty that this approach fails to achieve the objective more often than not.