I know it's a bit late but I have a great tip for everyone on here if something similar happens.
American Express My Essentials insurance cover.
£10/month covers all items/gadgets in your home including accidental damage. You don't need to register items below £250.
I suspect your ecutek cable would also have been covered.
It's amazing, considering mobile phone insurance could be £10/month it covers all mobiles in the family, in my case 5, all ipads (4) laptops, etc. Also covers loss of expensive transponder keys and if you are left stranded, they put you up for the night and get your car recovered, then replace your key.
No excess and easy to deal with, having recently claimed for a new ipad screen when I dropped mine on a recent trip to Litchfields.
I'm sorry that this doesn't really help you here, but it might help you or someone else in the future.