UK - Personal Amounts?

[enemyofthestate]

I was having a heated debate with a few friends/like minded individuals - and we were discussing about what the Government should have really suggested were defined amounts for "Personal use only" when they were reviewing the law late last year (in the UK)

I know they scrapped the idea, and that you cant form a real consensus amongst the millions of users in the UK as everyone is different - and what one of us smokes in a week, might last someone else 6 months, but we couldnt actually agree on what would be suitable that if police arrest you with, its only categorically personal use.

Weed for example. My brother felt that anything under an ounce should be ok, whilst my boss reckons you get risky when looking at anything over a 1/4.

Anyone think any different or got an opinion ?