Premier Inn Sleep Park Fly query

The Premier Inn on Bath Road near LHR seems to come fairly well recommended, so I had a quick question. It would be cheaper for us to book a room with them and utilise their deal with Purple Parking, rather than book the room at Premier Inn and parking at T3 short stay separately. Is it possible to utilise the Sleep Park Fly deal (which includes a night of free parking) if we're staying overnight the night we return from our trip? Reading it sounds like it's meant more for if you're staying the night before you travel. We arrive in the evening on our inbound from LAX this month and we'd like to sleep the night before driving back to Yorkshire.

Thank you!

I have no idea about the Premier Inn but Sofitel allow mw to park and stay on a different night to the date when I drop my car off in their car park. I sometimes leave the car at LHR, stay in London, return and stay at LHR, then fly out, return and collect the car.

I think you will need to call the PI or PP and ask them to be certain. I can not see the problem tbh, it is all business for them.