Ride-on lawn mover - not working (Nafferton YO25)

We have a 10 year old ride-on mower - Atco Rider 27H. It has a new battery, fitted this year. Just stopped working, something to do with the engine we think. It's cut a bit of grass over the years, the seat is repaired with gaffer tape. Will mulch or collect grass, although we haven't worked out how to get it to collect. It came with the house we bought, so we have no history.
You'll need a trailer to collect it, and a bit of strength to push it onto the trailer!

       
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