When is Enough not Enough?

I have just read this article about the government buying twenty two new chinook helicopters.

Now this got me thinking back to the news early this year, so i went back and i found an article about the amount of helicopters needed in Afghanistan.

Here is a quote from the article from July;

Gordon Brown clashed today with the outgoing Foreign Office minister Lord Malloch-Brown when he insisted British troops in Afghanistan had enough helicopters for the tasks they faced, and denied he had failed to prepare the country for the recent spate of British military casualties.

Now which statement is true, does the Army have enough helicopters now or doesn't it?

I would also like to point out a paragraph from the article today, see below;

Mr Ainsworth said the first 10 Chinooks would be completed in 2013, and the procurement would increase the UK's fleet of the heavy-lift helicopters from 48 to 70.

If they wanted to increase the helicopter fleet in Afghanistan, why didn't they buy chinooks that were already built, so the military had them within a few months not in four years?

In the above quote it says the following;

"The first 10 chinooks would be completed in 2013."

I hope i am wrong in what i am reading into this, but I hope that what he said in the quote has nothing to do with how long our military will be in Afghanistan. I thought Gordon Brown said that we will be pulling out within a eighteen months to two years.