OLCI and fasttrack

Is there any problem when checking in online and then using the fast track at Heathrow?

Just been on telephone to F.C over another issue. They say that LHR OLCI should be working as per the norm. LGW has software issues, they anticipate these to be sorted in next couple of days......

No problem. When you go to the bag drop area you will be given your boarding pass. If it is UC then you use Fast Track as normal. If you are in another class they will give you your gold sticker on the boarding pass.