Wow yes, I'd forgotten all about Pete Walker when browsing this thread (God I loved Redemption video as a teenager wanting to be corrupted). As exploitation-like as both titles may be in concept and execution, House Of Whipcord really does come off as a very good film, all the more for subverting the cheap sleaziness conjured up by its title.
I haven't seen any of Walker's other 70s Brit-exploiters, which include equally lurid titles such as The Flesh & Blood Show, House Of Mortal Sin and Die Screaming, Marianne. Interestingly, RABM and The Comeback were shown on British TV in the gloomy past of the censor-happy 70s and 80s.
Another great but now 'lost' 70s British horror: Spanish director Jose Larraz's 1973 film 'Symptoms', starring Angela Pleasance (daughter of Donald). It's a superb psychological thriller, of the rare 'daylit' variety, set in a gothic pile in menacing English countryside and paying more than slight homage to Repulsion.