So... what actually happened?
OK, I'm not the type who watches a film then spends hours on the net describing in pin-point detail exactly why it sucked. Personally I just found it slow and boring for the most part, so in my opinion: not a great movie, as no boring movie can really be classified as 'good'. However the fantastic acting, moody scenery and twisting plot were all pretty haunting, and today I've found myself wondering what exactly happened in it. As far as I can tell:
The whole thing about Spider/Dennis Clegg's mother being murdered by his father was a fantasy he made up to shield himself from reality, which is that Spider himself killed her. The young Spider was in love with his mother, and came to see her as a whore after he saw his father fondling and touching her all the time. Hence the fantasy about his father going to the blonde prostitute and killing Spider's 'real' mother (the quiet brunette - who never existed) with a spade.
The 'blonde prostitute' was Spider's real mother all along, but because of his jealousy he came not to believe it. He set up a weird device in the house using ropes and strings which would turn the gas on when he closed his bedroom door (I think) - does anyone know why in particular he chose such a convoluted way of killing her?
After that, the boy was sent to a mental asylum. The older Spider/Dennis Clegg comes out and goes to live in that halfway house, he comes to see the landlady as his mother, and again tries to kill her. This time he doesn't succeed, and he is sent back to the asylum.
Have I pretty much got it? If anyone can explain it a bit better I'd be grateful, cos despite the actual film boring the arse off me, I thought the plot was pretty cool.