Hey guys thanks for the information. I did understand about fare class (the first "L") but was unsure about alll the other letters after it. I think that tcook052 and DutchSE got the jist of what I was asking for. Sorry for getting people confused and heated.
I do understand of the different fare codes in existance and did check the Booking Class thread above but I believed that it did not seem to answer my specific question and wasn't sure of the remaining letters that might not let me accrue "Q" miles. I just wanted to make sure as the fare was the cheapest I have seen for a while (I ended up paying CAD$ 633.75 return which included taxes, fees etc. - not a bad fare I thought) and able to accumulate "Q" miles

podge, yes tcook and dutchse were attempting to answer your question in the correct manner. you'll get 100% status miles and $633.75 return airfare is ^

Exactly.........good on you podge! And good advice from tcook/dutchse/fatboyyvr too.

It was a good question. One thing worth looking at is when you get a fare with an X one way and a W the other. As was pointed out, the W (weekend) will be more expensive (and what is defined as W i think can be pretty extensive) but if you want to save a few dollars and can be flexible, you can shift the date, get both as an LLX... and the difference can be a fair bit.

I have wondered about this myself, so summarizing:

L - L booking class
L - Low season (H=high, K=shoulder)
X - Weekday (W=weekend)
AP - Apex
CAD - Originating in Canada

This seems to apply to a lot of fares (as listed in travelocity or expedia) but there are lots of other variations too. For example LLFSASOP, BLXAPE, BCAD

Generally, I am pretty knowledgeable on fares etc. but with such a low (C$633.75 all in) fare on AC (AC856 & AC859), I was wondering if there was a catch like not being eligable for Q miles etc. I take these flights a few times a year for a guys weekend in London and this has been the cheapest I have seen in a while. I have also heard of stories of some of the discounted Expedia fares sometimes not being eligable for accumulating miles.

Did you get that fare on expedia.ca? I can't find it...

I've gone to CDG this year on a price like that, L fare, and got 100% Q miles. You're good to go.

Yes I did (C$508.00 plus taxes). Having made the mistake of using expedia.com a couple of years back instead of expedia.ca and getting dinged for $US, I won't make the same mistake again.
I have been looking for fares for a while on the usual sites (AC, Destina, Travelocity etc) and the fares were quite a lot more and this is why I was also initally surprised with Expedia as they dont usually seem to be the cheapest. But I booked the fare, got the confirmation total in $CAD and once I got the AC confirmation code from my itinerary, went to the AC site and confirmed that it was booked. All looks well. With the savings, I should be able to afford a few more pints !!.