As @SAFC_FTM has said it is a legal requirement to lodge your deposit with one of the government approved schemes. The punishment isn't a fine on the landlord that goes into government coffers. It is a punishment that is paid to you in compensation. The current rate is 3 times your deposit. For example if your deposit was £500 and it was not held in a proper scheme he now owes you £1500.
Shelter give great guidance for tenants and landlords here.
If the landlord has been an arse and broken the law ask for compensation. (Before the inevitable pile on I'm a landlord but I always obey the law to protect me and my tenants)
Shelter give great guidance for tenants and landlords here.
Tenancy deposit protection rules - Shelter England
Landlords who fail to protect an assured shorthold tenancy deposit can lose their right to evict and face court claims for compensation
england.shelter.org.uk
If the landlord has been an arse and broken the law ask for compensation. (Before the inevitable pile on I'm a landlord but I always obey the law to protect me and my tenants)