Hallo from Jersey

I have a 2013 Freelander 2, HSE SD4 which I am generally delighted with. However, I have 3 issues I would welcome help with.
1. When I turn heating onto auto at 24C, the A/C light comes on - I don't want cooling though - is there a reason for this?
2. My EGR went on the blink and it was traced to a rodent attack! Any ideas as to how to prevent Rodents from eating my underside in future please?
3. I have a random and very intrusive "Bing-Bong" sound like a loud door chime. No fault indicators and it mutes the radio. It can happen several times in an hour, or not for 2 weeks, when driving. Checked everything that plugs in for dirty connectors but that has not solved it. Any thoughts please?
4. It lacks a reversing camera - any thoughts on how best to fit one please?

Thanks
Martin

Worth popping into the Freelander section for better answers. This is generally a hello to the forum.