Ist Class.
Check the Intranet. There is stuff on there about alternatives to parking in the Crew car park. You can go to another LHR carpark and BA will pay (I think the T5 short stay is excluded!), BA wil pay for a taxi / bus / train to T5. You can also pitch up dressed in civies and change at the CRC.
I had not heard about the vandalism in the crew car park. A real shame that some folk folk feel that they need to express a differing opinion in such a manner.
See you there - I'm in working for the whole 4 days, on both sides of the flight deck door!
T'Bug