Syon Park has a cafe in the garden centre (but it’s also near Brentford High Street). You have to pay to go around the gardens but you can get a residents’ discount.
Feather and heart is amazing for brunch in Brentford. You could take a look at the menu online to see if it’s what you fancy. Then could hop on a bus to Osterley park which not far or Syon park. Enjoy 😊
Just realised this 2 months ago, hope you found something nice 🙈
Brentford high street has a few new nice coffee shops, then walk to Watermans park. Even Kew bridge has a few nice brunch spots basically next to Watermans park, and it’s a nice walk along the river 🙏🏼