I assume you are talking about the section that starts at about 1:30. For anyone who hasn't heard the song,
here it is.
It certainly sounds like a synth. A quick search
for Chris Wyse's gear shows he doesn't have anything on his board capable of that kind of sound. I'm sure you could get close to the tone with a synthy fuzz, but the "sweeps" would be impossible to recreate that way. Running into a manual wah might help a bit, a Morley would be best in that case.
But I suppose a synth pedal is the only way to go. I've played with the Bass Micro Synth and I don't remember anything really close to that sound, but you could probably find something that would work OK. I've never used a Deep Impact, but from the clips I've heard, it might be your best bet. Maybe someone who has/had one can chime in.