The third instalment of this baffling Only Fools and Horses prequel was scheduled before writer John Sullivan's death from viral pneumonia on Saturday.

For that reason, it'll get a much kinder critical reception than would otherwise have been the case. But I will now never get to ask Sullivan what possessed him to rewrite the nation's sitcom as a drama (or at least a sitcom without any discernible jokes).

It's 1962 and we're following the love affair between Rodney's mum Joan (Kellie Bright) and his criminal father Freddie (a moustachioed Nicholas Lyndhurst).

The young Del Boy (James Buckley) has got himself a Lambretta and a fiancee called Barbara (Jessica Ashworth). The scene in which we meet her middle-class parents offers a flash of what this might have been.

Sullivan's death means we can probably expect more Only Fools and Horses repeats in tribute, which will be much better to remember him by than this.

John Sullivan, the marvellous comedy writer who created Only Fools and Horses, died at the weekend aged 64. Tonight his prequel of Only Fools, Rock & Chips, returns. Showing the misadventures of a young Del Boy Trotter, it was partly inspired by Sullivan's own youth in South London (the significance of the title, he said, was that in those days "rock music and chips was what we lived off"). Nicholas Lyndhurst (Rodney Trotter in Only Fools) plays local gangster Freddie Robdal, with James Buckley as Del Boy and Kellie Bright as Joan, Del's mother and Robdal's mistress. In tonight's episode, Del Boy turns his charms on well-to-do Barbara Bird (Jessica Ashworth), and the police pursue Robdal over the Margate jewellery heist.