Amex Plat is kind of an 'all in one' travel package. However, you do NOT actually USE the card because the earnings rate is poor!!

Free BA Silver card (well, actually a Cathay Gold but it gets you all the BA Silver benefits inc BA lounge access)
Decent travel insurance albeit with restrictions
Starwood Gold
Carlson Gold
Accor Platinum
Free car hire insurance and a decent Plat deal with Hertz that gives a 4 hour grace period
Special deals at luxury hotels via Fine Hotels & Resorts
Odd freebies like a free night (no catches) at a Melia hotel we got this year and £70 credit to spend on clothes at Matches
2 x Priority Pass cards that get 4 people into airline lounges between them, unlimited free visits
Eurostar lounge access
30,000 Amex points for signing up, convert into 30,000 Avios

Whether that lot is worth £450 is up to you. However, the fee is refundable pro-rata if you cancel so there is ZERO risk given the fat sign up bonus.

More background in my review here - http://www.headforpoints.com/2013/03...m-charge-card/ and more discussion at the Amex FT forum as mentioned above.