Can I as EU citizen visit the UK in December and January? [closed]

I live in the Netherlands and have a Dutch passport. My partner (not married) lives in England and has a British passport. I would like to know what is possible and impossible regarding visiting my partner during different stages of lockdown/tiers. I found Will inbound international travel be affect by the latest lockdown? and How does UK quarantine work for visits specifically to see family?, but my circumstances are a bit different.

I am not looking for loopholes, just want to know what is possbile with the current lockdown or when the lockdown would end. Answers that link to the relevant sections of the gov.uk guidelines are highly appreciated!

My ideal journey would look like this:

Travelling from The Netherlands to the UK at the end of December. Going straight from the airport to my partner's home.
Quarantine for 14 days together with my partner. Meaning we both won't leave the house (having groceries delivered, etc) during that period.
Staying an extra week with the possibility to go outside, sticking to the COVID measures at that time (if we are only allowed to go for a walk to the local park, so be it).
Flying back to The Netherlands in January.
Quarantine for 10 days in my own home.

I don't see any issues on the Dutch side. The negative travel advice to the UK is only an advice (so it's not illegal for me to travel to the airport and leave The Netherlands), when I come back I will have to self-quarantine for 10 days.

The questions that I have are for possible situations in the UK:

Am I allowed to enter the UK as a tourist during lockdown? Or when the lockdown ends and Tier 3, 2 or 1 are in use?
Am I allowed to travel from the airport to my partner's house during lockdown? Or when the lockdown ends and Tier 3, 2 or 1 are in use? Don't know if this counts as one of the specific reaons for which travel is allowed.
Am I allowed to quarantine at my partner's house if my partner goes in self-quarantine as well?
Are there legal Brexit limitations when I stay till January? Practical issues like roaming or adjusting my travel insurance can be easily overcome, but if I'm illegal without a visa that would of course be a problem.

uk covid-19 eu brexit

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Can EU citizens visit UK now?

If you're an EU , EEA or Swiss citizen Irish citizens can continue to enter and live in the UK . EU , EEA and Swiss citizens can travel to the UK for holidays or short trips without needing a visa. In other cases, find out if you need to apply for a visa to enter the UK .

Can EU citizens travel to UK after 31 January?

Essentially, EU citizens who were already living in the United Kingdom prior to 31 December 2020 can stay and can continue to enjoy more extensive rights than EU citizens arriving to take up residence after 1 January 2021.

Can I enter the UK after 31 December?

If you started living in the UK after 31 December 2020. If you have a family member in the UK with pre-settled or settled status, you might be able to apply to join them in the UK under the EU Settlement Scheme.

Can EU citizens travel to UK after Brexit?

From 1 January 2021, the UK implemented a new points-based immigration system. Under the new system, if you're an EU, EEA and Swiss citizen, you can continue to come to the UK as a visitor without applying for a visa and in most cases, will be able to stay for up to six months.

Post Brexit: EU Passport Required When Travelling To The UK

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

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