Welcome to the forum
.
Given the current lockdown, how are you planning to actually leave the UK?
Holidays abroad are not allowed at the moment, so they likely won't even let you board the flight unless you can prove that your trip is essential... i.e. for work reasons or a family emergency. From what you've mentioned, I don't believe your trip will qualify as essential.
- Will I be stopped as I am not currently a spouse? (Told that this would not be affected)
- How will I prove that my visit is purely to see family? (Gave address of TX house in ESTA)
- How will I prove that I will only be isolating in one location that is my partners house only?
- My ESTA was accepted with all this information but does it hold weight?
Because of the travel ban on non-US citizens/permanent residents arriving from the UK, if you try to travel to the US from the UK and you are not exempt from the proclamations (i.e. you are not married to a US citizen), your ESTA will be cancelled. Only spouses, parents, children and siblings of US citizens are currently exempt from the US travel proclamations.
So, in order to be allowed into the US, you would need to provide evidence that you are married to a US citizen... which you are not.
From the ESTA website:
Will my ESTA be cancelled if I am scheduled to travel on or after 11:59pm EDT on March 16, 2020?
In accordance with Proclamation—Suspension of Entry as Immigrants and Nonimmigrants of Certain Additional Persons Who Pose a Risk of Transmitting Coronavirus effective at 11:59 p.m. eastern daylight time on March 16, 2020, the entry into the United States is suspended for most individuals, other than United States citizens and lawful permanent residents, who have been physically present within the United Kingdom and Ireland within 14 days of travel to the United States. In addition, Proclamation 9993 applicable to the Schengen Area, Proclamation 9992 for travel from Iran, and Proclamation 9984 for travel from the People’s Republic of China all remain in effect. Any traveler with a valid ESTA who attempts to travel the United States in violation of the Proclamations for the Schengen Area, the United Kingdom, and Ireland will have their ESTA canceled. ESTA will not refund applications that are canceled due to this Proclamation. Travelers who are subject to the Proclamations should cancel or postpone any travel until no longer subject to the Proclamations, or the Proclamations are rescinded.
(
https://esta.cbp.dhs.gov/faq?focusedTopic=United%20Kingdom%20and%20Ireland%20Travel%20Proclamations)
So, essentially:
- you will not be allowed to leave the UK because your trip is not going to be considered to be exempt from the lockdown restrictions
and
- you will not be allowed to enter the US because you are not the spouse of a US citizen