Where can you get your ehanced crb check for free?

CRB checks were replaced by DBS checks in 2012

The government have a set price of £44 for DBS checks for paid positions and no charge for DBS checks for volunteers. On top of that (whether voluntary or paid) you will still usually face an admin fee of around £10, depending on the organisation who facilitates the check.

Some employers will pay for DBS checks but a lot will pass the cost onto the individual so it's pot luck I'm afraid.