The 30-year-old was released by League Two Gillingham at the end of the campaign and had a number of clubs in the Football League interested in his services.
But a meeting with the Hatters duo of Buckle and Sweet quickly made it clear to Spiller that his future lay at Kenilworth Road.
He said: “I was very impressed with both Gary and Paul when I met them and was that impressed by their drive and ambition that I signed after the first meeting.
“I had agreed in principle within about an hour of just chatting with them, that was me and that was what we wanted to do.”
For the full interview, see the Luton News/Dunstable Gazette on sale today, while for all the latest Luton Town FC news, reports, stats, player profiles, live match updates, prediction table and a complete fixture list, visit our Hatters Microsite.