In-ear headphones from jLAB that both fit well and have good sound isolation. They have clever buttons that you can use to quickly skip songs or answer a phone call.
From Argos
JLab JBuds ANC In-Ear True Wireless Earbuds - Black
House of Fraser
JLab JLab JBuds ANC 3 True Wireless Earbuds - Black - Multi
This product is also available at 5 unverified stores.