Can you still get furlough while working for another job ?

Hii, guys hope all is well, I’m currently working at two places at the moment but it always has been even before the lockdown started I used to do 2 jobs my main job was working at Heathrow airport and my second job was working at McDonald’s 

so when lockdown happened and the furlough thing started I started receiving money from both sides but recently McDonald’s opened and I went to work there full time 5 days a week and my main job Heathrow Airport I won’t be back until October and I’m still getting furlough from there and I work 5 days in McDonald’s, I mean is this allowed will they charge me back many thanks