The cheapest way, but maybe not the most efficient way to get your DSC 1 is -
You will have to pay the DMQ certification cost and those of the assessment centre per candidate (£90). If you can additionally club together to pay for the assessor (whatever he charges - can vary from £150 to just expenses) this is the cheapest way to get your level 1. We do assessment only at exisitng DSC 1 courses and charge £140, although places are limited.
In summary if you have 10 candidates, you all pay the £90 and throw in £15 each for the assessor.
Hope this helps, Peter