I usually take the Heathrow Express after work - having taken my luggage in to work in the morning (on the occasions that I do have a large suitcase). However I work in Central London and this week the tube has been terrible and its been a struggle to get on so wasn't keen on trying to manage it.
I had thought about driving to LHR tonight to drop of bag and going home afterwards. I could drive tomorrow but then I have to pay to park my car near my office which will be at least £40 for the day and then risk getting stuck in traffic. It's taken over an hour to do what is normally a 20 minute journey this week.
I think I'll just manage on the tube and leave extra time. I'd rather have the money this weekend!