Simon,
Waste oil is in demand at present, poor quality oil (highly homogenised and with a high free fatty acid content) is selling from 15-20 pence, the better quality waste oil is currently selling at anything from 22 - 28 pence per litre.
Production is generally a matter of scale, we don't produce ourselves, but access supplies from many producers around the UK.We are aware there are over 700 at this time!!
Currently our best price for biodiesel is around 71.5 pence per litre (including duty) delivered in a 30,000 litre tanker. This equates to around 84 pence per litre with VAT. Prices vary slightly dependent on volumes required, and delivery area.
We can also supply biodiesel pre-blended with derv, enabling users to stay within their vehicle manufacturers warranty limits.
Rob