It covers the inspectors when they're walking through a house.

A party-wall agreement is put in place that covers the cooperation needed by the two owners.Since land is so expensive, I've seen folks buy a $400,000 SFH on a lot zoned for duplex, they scape the home and put a new duplex in place.

A true NNN covers everything.Hands off yes is important.  

This includes picking out paint color.I have a rental that I will include pictures of to get an idea of the room surroundings. 

Use pictures from google images to simulate before/after representations of a job similar to one you've had recently and ask what they would charge for something like this.

Assuming I have 8 years before my water heaters break down and over 20+ for my roof i think 80k in reserves over 20 years with 4-5k in maintenance fees a year should cover?  

All of my rentals to this point are single family and our current insurance company does not cover this type of property so I am starting from scratch.  

Depending on the amount of capital you have and what type of investing you want to do in UK, you may want to consider starting here and moving when your investment income can cover your starting costs in the UK.

If the tenant doesn't pay enough money to cover both rent and garbage by applying credit to the garbage first he will be short on his rent, making him subject to late fees and eviction for non payment of rent.

Working with two different professionals in two different locations will prevent either form being able to see your big picture and plan/adjust accordingly.