"Siemens Premium Hilton code (N0079268) is a higher-tier Siemens corporate code at Hilton. FlyerTalk's "London Hiltons now requesting corporate ID if using codes" thread specifically documented systematic enforcement for premium-tier corporate codes. Siemens' Munich and London presence means premium Hilton properties in those markets (Hilton Munich, Conrad London) encounter Siemens employees regularly. The "Premium" designation suggests deeper discounts, which correlates with higher enforcement probability."

"I know that previously the Hertz IBM rate was always fixed in the mid $30s for a full size vehicle with last car availability. A minivan was $175/week in Orlando even during President's week when the going rate was about $1,200. This is probably why Hertz and at least Avis has been more strict. I have found Marriott to be very strict, especially at key locations, when it comes to the government rate. Marriott wants travel orders, a government ID, and/or a government credit card. I found Hilton to be less strict for those government rates."

"I have used heavily discounted corporate rates for many years all over London, and have not yet been asked for ID. If I was, all I could do would be to send an email from my work account which at least is clearly from the associated company."