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.  

I've seen some do an acid wash and not try to cover up the existing but just clean it up.In the photo, the real wall paint color is by Sherwin Williams Interactive Cream.

@Filip Vaco the TransUnion SmartMove screening is the one BP recommends as you can go to the Tools section for the link.  

List all on the same lease and all must pay for application fees and be screened.

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.

I also use a score sheet as part of my screening process and if you are late then you loose a point. 

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.