Chilledout , you say My partner lives in West Cheshire, currently in the high tier. I can’t leave, however she is free to pop over to me see me or go.
If shes in high Tier she can visit Wales for now but she isnt suppose to mix with any household's anywhere in the UK including Wales so am not sure its right to say she can come and see you.
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That’s why I chose my words carefully and said she can come and SEE me i.e. quick socially distanced chat in the garden prior to or after doing her shopping etc.
Hell, if she wanted to she wanted to she could have a little jaunt over to Snowdon , then return to England at her leisure, which is what the FM of Wales wanted Boris to prevent but he declined, hence the Senedd have introduced it themselves, despite encouraging fBoJo to do the obvious.