1/2 BSP shower connection size?

I need to buy a new fixed shower head. I removed the old head at the pipe which extends from the wall and bought a replacement 1/2 BSP shower head. I bought this Wassa shower head on Amazon
High Pressure Shower Head - 3 inch Anti-Clog Anti-Leak Fixed Chrome Showerhead - Adjustable Metal Swivel Ball Joint with Filter - Ultimate Shower Experience Even at Low Water Flow & Pressure

It has good reviews. I’ve tried to fit if but the 1/2 BSP is too big. The shower head just slips over the threads. I can’t have standard 1/2 BSP connection size.

What size would it be?

This is a newish built house maybe 15 years old now.

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