I really enjoyed this episode and although it did have a few low points here and there, it's still one of the best from Boosh that I've seen to date. The writing and overall style of the show has now completely evolved into something coherent and interesting. Before now the guys seemed to be throwing around ideas, experimenting with this and that, which worked some times and at others didn't. With the opening couple of shows of series two however it's clear that they have found a distinct style that not only capture's the brilliance of the first season, but allows the progression and creativity that the show thrives on at the same time.
This episode in particular features one of the best plots of the series for me, allowing room for lots of great gags both physical and verbal. I especially loved seeing Howard dressed up as a goth and describing his toilet habits with the girls. The whole evil granny idea (although a little cliché) worked quite well too, but I didn't feel it added much on it's own to the episode other than opening up some great moments with the guys. The episode's song was also brilliant and fit it well, sticking to that same brilliant Boosh formula yet still being distinct from past creations.
So definitely one of my favourites from the series thus far, I just hope they can keep up the pace!