Van Dyke made an important decision.[1]
Bobbins cast page Dec. 2000: 'Tim's younger brother and a prodigious musical genius, Van Dyke has already managed to win Holly's heart. Will it last?'
Bobbins cast page Aug. 2001: 'Tim's younger brother is a musical genius, currently roaming the Himalayas in search of Holly West. He idolises his brother, yet cannot help but upstage him.' An addition in June 2002: 'Now occupies Shelley and Fallon's attic.'
As seen in 'Expecting to Fly', his first name (presumably indicating 'Van Dyke' to be a pseudonym) is Stephen.