It is possible that they might not notice. But, in any case, you should take steps to curb the gambling before it becomes an insurmountable problem --- losing that amount regularly must already be stretching the budget to breaking point.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014 http://foggy.blogs.iva.co.uk