I don't know where to turn.

I have a conviction for an internet downloading offence. 

I got a job as an accountant in an office where there are no children and where the employer does not require a DBS check (as it is not a relevant job).  I have provided evidence to probation showing that the internet access is controlled and shown them a screenprint of the message showing what happens if you try to access a website that is not in their policy.  I have also shown them the IT security policy which explains that the IT department actively monitors staff internet access and activity.  I feel that this is enough to show there is no risk.

Probation have now said that they would still want disclosure and if I don't disclose they will.

My previous probation officer had no problem with my employment and was happy that it was part of my rehabilitation.  She went off sick and my new probation officer is pushing this issue.

My question is whether probation are legally allowed to disclose without my permission or any request from the employer?

Also I was wondering if you has any contacts at law firms in London who would be able to advise me on this issue.

The other thing probation are aware of is that in the past I had issues with suicide and self harm.  For the past 2.5 years I have been moving forward positively and rebuilding my life and my previous probation officer was very supportive of this.  This change and development has set me back three years and is very negatively affecting my mental health.

Any help would be very very very gratefully received