From what I understand, electric mowers aren't as powerful as gas-powered. I've been told by former users that they actually had to mow more for that reason (couldn't let the grass get too high or thick).
I'm in the States, and just went through some lawnmower drama. I had to return 2 Sears Crapman (not a typo) mowers because they were defective. #1 mowed 4 times and ran out of oil--no drips, just gone. I filled it up with oil and let it sit for 24 hours. When I tried to start it, it smoked like a BBQ pit. #2 mowed for 10-15 minutes, then stopped. I thought it might be clogged with grass, so I tipped it up slightly to have a look. When I set it back down, after removing the small amount of grass near the tip of one blade, I saw oil dripping near the gas tank.
I now have a Troy-Built, and treated myself to an electric starter. It's gas-powered, and also has the option of pull starting. So far, so good. With all the rain we've had in Texas, I'll be mowing like mad for a while!