'I obviously will only pick 2 aspirational choices'. Why is this obvious? They aren't even 'aspirational' choices. You meet the grade requirements. Ignore what Tommo said. They are hard to get into though of course - which is why the more you apply too, the greater the chance of getting in.
I would say pick at least 3 of the 'top' unis and either 1 or 2 of the lower rated RG unis that do not require LNAT.
The safest thing to do is to apply to two non-LNAT RG unis like Brum/Leeds/Notts/Manchester. Ignore the fact they are all A*AA grade requirements - the non-LNAT unis you can use as an insurance. They should accept you with at least AAA.
Then apply for 3 LNAT unis. You mentioned you wanted Durham, UCL, KCL so there is your three.
You do NOT need to apply to a uni outside the RG, even the good unis outside of it, as they will only be in clearing for law if on the small chance you don't get the grades you need.
You can look for yourself in clearing on A Level results day and you will see that I am correct. It is just a complete waste of an application spot applying for (let's face it) a rubbish uni.
If you want Oxbridge then I would apply. You have the profile to be considered for an interview at Oxbridge. If you don't want to go there, don't apply. Do not be pressured by family.
And don't apply to bloody Goldsmiths!!!