I was recently offered a job that had no mention of DBS checks etc only after signing the contract of employment was then emailed 2 days later and 2 days before I was due to to start that the offer was being being retracted. I was honest on the onboarding process as im on a 10 year SHPO (which is another issue all together!) 

Can anyone point me in the right direction if this is legal or not?

Cheers