Ground source heat pumps questions

• What is a ground source heat pump?
• How does a heat pump work?
• What is CoP?
• What types of heat pump are available?
• Will I also need a boiler with the Greenstore system?
• In which type of properties can heat pumps be installed?
• Can I keep my existing radiators?
• Can heat pumps heat swimming pools?
• Will heat pumps work on the coldest winter day?
• Can a heat pump system integrate with solar panels?
• Will a trench system affect my lawn?
• What is a trench system?
• What maintenance and servicing is required for heat pumps?
• What planning requirements should be considered?