Insurance for garage demolition by family

[Jane W]

A bit of advice needed please! We have sent in a notice for Intended Demolition to building control to demolish a double garage and single garage on the plot. I've called them today and they said they haven't got it, but that's a different story. They said the contractor would need to complete the form and supply 'other necessary' paperwork. I said we were going to demolish the garages ourselves. She asked if the garages were under 50 cubic metres, and then said they won't be as that's only 1 single garage size. She said we would need to send in our insurance and employer's liability. We don't have any employees and we (and our adult son) were planning on doing the demolition to ground level, with contractors taking over to deal with the foundations as part of the groundwork.

Anyone been in a similar situation and have any advice regarding insurance for the demolition and ensuring cover for family demolition members? 

Also the plot is at the rear of a house and before the purchase of the plot the sellers disconnected the electricity.

Do I  still need to have official confirmation that no electricity or gas is connected for demolition? 

We've had an asbestos survey which said there was none so thats one thing hopefullyticked off.

Any advice regarding insurance or communications with building control would be very much appreciated, thanks.