Thanks for the all the replies, I now have a list of must haves to get for day to day upkeep after I get it detailed. I will get some sort of ceramic coating put on it but I suppose which one I use depends on which detailer I use, just looking into ones around my area at the minute.
As for ceramic coatings, how good are they at reducing swirl marks from washing/drying? Would it work with a jet black iPhone 7+?
I think ceramic coatings can vary greatly. Something like Gtechniq Crystal Serum (which purportedly lasts up to 7 years!) is different to some other coatings in that it forms a bond with the paint/clearcoat at the substrate level thus becoming the new base to the point where it is for professional application only, and can only be removed by wet sanding, whereas most other coatings can be machine polished off. By all accounts supposed to be more resistant to swirls and scratches than some other coatings.
Whatever coating you choose, the greatest risk of swirls and scratches comes from regular washing, drying and application of protection. Therefore developing a good, safe technique for these processes is important. The more 'touchless' the better, so use of snow foams and/or other pre-wash solutions can reduce the amount of necessary contact, leaving the main contact with the paintwork being the bucket/mitt wash, and the drying phase. Even with drying you can reduce contact by usiing an air dryer, should you wish too, but a careful dabbing technique, as opposed to rubbing) with a towel will minimise swirls. And most importantly making the final rinse one done using a open ended hose (no jet washing lance or spray head attached) will make the water sheet off the car, leaving the minimum amount of standing water for the drying towels to mop up. Similarly when applying anything protection wise to the car, such as Quick Detailers, top coat sealants and waxes, careful and gentle application and buffing is key to avoiding marking the paint, and good quality applicators and buffing cloths can help a great deal. All these precautions and measures aid the reduction of inflicting swirls and scratches, thus prolonging and preserving your paintwork.
In terms of applying a coating or sealant to your gloss black iphone 7, yes you can apply it just as you would to the plastics on your car. I know a number of people, myself included, who use automotive coatings (like of C2v3, C1 etc) on other stuff including household stuff - bathroom stuff, kitchen surfaces, music speakers etc. I applied C2v3 to my white gloss kitchen units when had a new kitchen fitted last year and to the ceramic hob. I've got a gloss black iphone 7plus but haven't put any on it yet, but next time I have the spray out, probably will, lol. I don't think it will stop it scratching but will proably make it easier to keep clean.