we met at the "wrong one" in 2015 ( my only visit...)
but got through the gates in @3 mins,
today I (in the older car) gave-up after @ 90 minutes..:bang:
parked outside and walked around a mile to the museum entrance.
with the building / development work going on the site.. it somehow seemed worse than the 2015..
I'd have asked for a refund if you couldn't get your car in.