I've decided to look at experimenting with neutral density filters and I found this variable neutral density filter on Amazon here in the UK.
It's a lot cheaper than buying a set of filters of different densities, so I was wondering if it would produce similar results to a fixed filter when set appropriately? I realise I have the added complication of setting the filter to the desired density, but as this would be my first foray into this area I don't want to spend a lot of money if I'm not going to use it a lot or get serious with the effect.