This is great as now i have a part number as when I pulled the original microswitch apart to fix it internally, the button flew away - never to be found.

These are great prices for little switches, however living in the UK means an expensive courier to £15 and a lounge wait. They simply do not sell these here in the GB :-(

The part with shipment is far cheaper than a brand new MX Anywhere mouse.

Thanks again for the info!