I'm with JessK.
Afternoon tea at a nice hotel.
If you wanted to spend more you could take some flowers with you
I wouldn't buy jewellery -too personal and you might buy something you think she will love but she doesn't.
Another idea is to buy her an orchid.
I have dendrobium orchids that are years old but keep flowering.
I buy them online.
Excellent value.
Estranged Son and Future Granddaughter
To think that London, or anywhere else for that matter, does not belong to any one demographic