Cadillac (5.8 metres - 19 feet) Nothing was said regarding the longer car.
He was still under the 7 metre limit tho!
Having used SF for first time this year, I would say in their defence that the internal turning for loading and unloading cars is VERY tight and anything oversized could really bugger it up! I followed a TVR Tuscan unloading and he had to reverse on every bend - bet his arms were hanging by the time he got out!!