I think Bekers WERE used in Crimea, but would probably have been converted to percussion.
The Brunswick was also likely on issue. England was caught going to war having adopted the P53 to replace most guns in service, but without nearly enough rifled muskets to fill the role. As a result, regiments went off to fight with a hodgepodge of smoothbore muskets, rifles, and several calibers. All non-deploying units in the UK who had been issued P53's had those arms recalled and were re-issued older smoothbores to free up as many Pattern 53 muskets as possible. All new P53 production went straight to units at the front and by mid-war, most units had P53's.