In Ireland I get 5,000 euro as a grant off the price of an EV and I also get a tax credit worth 2,468.80 euro. The tax credit is a % of the price of the car. I also get 600euro for the home EV charger. The 7,468.80euro comes off the price of the car. I just have to sign a form to say I am purchasing the car for personal use and not to resell it and the dealer takes the money off the price and I don't have to fill in any forms. The 600euro for my home charger, I have to fill out a form and claim that back after I get the charger installed and I pay for it in full. you need to apply for the 600euro in advance, a simple web form to fill in and once u get approval u proceed with the installation and then upload a copy of the sales invoice, the certificate from a certified electrician and u get the 600euro paid into your bank account.
As regards negotiating with the dealer, there is zero room for that. The price I pay is the recommended price from Mini and this is the same at every dealer. There is no variation in price. Different dealers may offer a better trade in value if u are trading in a car and u can generally negotiate a few hundred euro worth of extras for free