Is this a metal real with plastic centre spindle ? HRM is the name i think .
If so where is the leak , between the plastic to brass or on the brass to brass swivel ?
If its between the where the brass knuckle threads onto the plastic spindle then ptfe tape , 5 or 6 winds should sort that out , if its on the brass to brass part try to get it so there is no pull on the hose from any angle , i find that if its pulled to one side or the other i get leakage ,if its left so that water pressure lets it find its own resting point it will seal up under pressure .
As for your fitting to the real , it sounds like the rubber o ring on the brass knuckle is to blame or the hozelock fitting itself is faulty , you must have a spare on somthing else you can chop and change to see .
Failing the above it could just be down to too much feed pressure , try knocking it back a bit
Hope this helps , if not get some armbands bud

Regards Rich