Well, I'll be going (early night off work ) plus the venue is only 20 minutes from me. Probably get there around 4:15 just to make sure I get in and good position etc.
Thar we go, booked my ticket to arrive in Euston at 15:36, so I should hopefully arrive before Thursday. Checked online and it says the tube ride should only take a few minutes to get to Leicester Square station, so if things go to plan I should be there before 4. I'll PM my mobile brick number.