Award seats JFK

Hi all,
I have booked an award flight MAN to JFK via LHR with a combination of Little Red outgoing and connecting to UC in September, but due to having to travel on a specific day have ended up with about an 8 hour layover at LHR due to their only being availability on the 17.15 from LHR and on the first LR flight. At first I wasn't bothered, thinking I'd never been able to explore the Clubhouse before etc but the more I think about it it's absolutely ages, and I'm sure even I couldn't find enough to do to keep myself amused that long! I've checked fairly frequently and there doesn't seem to be any availability for the 14.00 departure. Does anyone have any experience with this route and know if and when Virgin may release some seats on this flight? (I know it's all down to inventory management but thought there may be a date when they're more likely to be there.) Also, if this flight did come available what would be the charges to change, would this increase or be restricted very close to the date of the flight?
Thanks in advance if anyone can help.
I have booked an award flight MAN to JFK via LHR with a combination of Little Red outgoing and connecting to UC in September, but due to having to travel on a specific day have ended up with about an 8 hour layover at LHR due to their only being availability on the 17.15 from LHR and on the first LR flight. At first I wasn't bothered, thinking I'd never been able to explore the Clubhouse before etc but the more I think about it it's absolutely ages, and I'm sure even I couldn't find enough to do to keep myself amused that long! I've checked fairly frequently and there doesn't seem to be any availability for the 14.00 departure. Does anyone have any experience with this route and know if and when Virgin may release some seats on this flight? (I know it's all down to inventory management but thought there may be a date when they're more likely to be there.) Also, if this flight did come available what would be the charges to change, would this increase or be restricted very close to the date of the flight?
Thanks in advance if anyone can help.