The UK position on this is described in AIC 17/1999, thre are a number of differences from ICAO including increasing the spacing to 4 nm on final approach behind B757, VC10, B707, DC8 and IL62 aircraft when followed by an aircraft of Medium or smaller catagory.
You can read the AIC at
http://www.ais.org.uk/aes/pubs/aip/pdf/aic/4P188.PDF