They produced two albums--both with PB compositions, but the latter w/o Brown (you're familiar?...). I swear by Mantle-Piece (the Ornaments album sans Brown)--nothing against PB, only that that ensemble seemed to understand transparency and groove in the UK jazz-rock vein better than many of their peers. The first BO album (with Pete) is a little too stridently clever to rank with me (Aylerisms and all), but Pete's lyrics were a gift, I find, with an interpreter who didn't milk them for the sentiments behind the obscurities (like Spedding, or even Jack Bruce, who made the subtler elements of PB vaguer, if anything).
I'm honestly not that familiar with Hawkwind, but you've piqued my interest.