There is no more BMQ-L for infantry reservists. You go straight from your BMQ onto your DP1.1 then your DP1.2, I am unsure how long in total this makes the DP1 portion though, so I'll defer this to someone who actually knows.
After course you train from September until November, one day a week + one weekend a month, and are stood down from mid December to the beginning of January. The one day a week + 1 weekend a month training cycle continues after you are stood back up. There are some discrepancies, sometimes you might not have a weekend training ex on a certain month for example, but it is the exception not the rule