Help identify duck breed

Can anyone help me identify this duckling?  I bought (or so I thought!) 2 white runner eggs, 2 apricot bali eggs and 2 white runner eggs for hatching.  I have ended up with one white runner (in photo) and another duck with a grey/black beak and some lovely markings coming through but it doesn't look like any of the breeds it should have been.  Any suggestions as to what it might be?  I think it might be a female as it has developed a quack in the last few days (its just over 5 weeks old).

PS:  The runner in the photo was bullied and pecked by the drake and is now well and truly separated from him but you can still see bald patches, poor thing 

Thanks for your help 

very cute, but sorry cant help with naming the duck breed