Kevin Sheerin is the driver of Ken Livingstone's campaign bus

What sort of bus is it?

It's an open-top Metro bus from the mid 60s, an ex LT bus. It didn't use to be open top, but one of the drivers took it under a low bridge in Battersea - sliced the top off. He was supposed to turn left, did an illegal right instead and ignored all the low bridge signs. No one was hurt. He was a new driver but the police had to prosecute and he lost his job.

That's never happened to you?

No. I have to watch out for things like that - bridges, lamp-posts. It almost happened in Redbridge when we came across Steven Norris in his car (we were out looking for his bus but only found him in his car, going into the leisure centre). There was a 14ft bridge and we just made it under. I had to have someone on the roof to give me the all-clear.

That would have been embarrassing - crashing right in front of Norris.

Yeah, that would have gone done down really well.

What do you know about the other candidates' vehicles?

The Greens have got a bus I think. I heard it got pulled up for smoke emission - I don't know if that's true. Norris's bus got pulled over - but just for a routine check.

How green is your bus?

Very. We use this green fuel. It doesn't spew out black fumes like some do. Nothing comes out at all.

Is there anything else special about your bus?

All the seats upstairs have been taken out and it has a generator and speakers.

Who's on the bus?

There's a crew of about 15-20 volunteers. They just stand upstairs waving, and singing along with the music.

Where does Ken go?

He stands upstairs at the front with a hand held mic. There's a camera crew up there too so we have to take it very easily - no sudden braking if I can help it.

Isn't it off-putting, driving with all that racket going on?

I do sometimes have to tell them to turn it down. There are two speakers right above my head and when it echoes back off the sides of buildings it can be too much. Normally it doesn't bother me. You get used to it after four weeks.

What sort of reaction do you get from the bus?

We get a lot of waving and cheering. And the odd finger as well. There's also been at least a couple of moonies. One time when Ken was upstairs, this bloke came out of a betting shop on the Walworth Road to see what all the noise was about. And he just pulled his trousers down. He was quite friendly really. I think Ken was quite surprised - it was the first time it's happened to him on a campaign.

Will you vote for Ken?

Oh yes definitely. But I would have done anyway. I was there when he brought in "Fare's Fair" in the 80s and that was a good scheme.

Why is Ken always late?

He's not. We're always spot on time. To the minute. Yesterday we were a little bit late because we got held up round Liverpool Street, but normally we're spot on time.