Located in Birkbeck Road, Acton London W3 6BG.
Here's a map so you can get an idea of where I am.
Birkbeck Road is, for the large part, parking permit. There are some paid parking spaces, at the lower and upper ends of the road. Traffic wardens ( 2 off), who are quite trigger-happy, lurk somewhere within the Acton stratosphere, ready to pounce when the need arises.
The times to really look out for are 9:00 am to 10:00 am, and 3:00 pm to 4:00 pm. I believe, according to the parking notices, it's supposedly safe at other times, and is certainly okay from 5:30 pm onwards, and weekends also appear to be safe. Please ensure you check before leaving your vehicle. Also allow enough time for your massage so you don't have to rush to avoid a penalty.
I have contacted the council about getting a transferable permit for clients to use, however, this is not something they have been helpful with and is not available. Apparently one can only get a permit if one owns a vehicle, and the permit is not transferable.