I evaluated privacy film options specifically for light transmission performance in UK light conditions when sourcing for our ground floor street-facing rooms after enough experience with products that delivered privacy at the cost of room brightness to recognise that specification for UK conditions rather than general performance claims is the most important variable. https://www.tintfit.com/shop/privacy-products provides privacy window film options suitable for UK ground floor properties with product information that supports selection based on the specific balance of privacy and light transmission relevant to typical UK residential light conditions.