See page 8 here:
http://sentencingcoun...ine_-_Crown_Court.pdf
'Culpability' is clearly 'low'. If 'harm' is also assessed as being 'low' then it's a Category 3 offence which will almost certainly result in a Community Order.
If 'harm' is assessed as 'high' then it's a Category 2 offence, which would result in the Magistrates passing the case to the Crown Court for sentencing (as per that page).
It should be noted that the sentences shown there relate to a first-time offender who is convicted after a trial. Your early guilty plea would see a reduction in the sentence (of one third in the case of a custodial sentence, although I think that your case probably falls just below the 'custody threshold' anyway).
Chris