If in the UK, you better have some tact, otherwise it'll go down like a lead balloon ! Personally I'd make up a lie: "Oh! What a great idea those posters are..

If in the UK, you better have some tact, otherwise it'll go down like a lead balloon ! Personally I'd make up a lie: "Oh! What a great idea those posters are...I lost my dear brother to sepsis...they told us it's so easy to miss..."