The Welsh Government have just release the Welsh Index of Multiple Deprivation (WIMD) dataset, updated for 2025.
We've made this available as an overlay layer for Icon Map Slicer in Power BI.
Simply paste this URL into the Vector Tiles URL section in the "Overlays / Reference Layers" section of Icon Map Slicer's format pane:
https://iconmappropublictiles.blob.core.windows.net/catalog/wales_IMD_2025/styles/wimd2025_overall.json