Hi there, I'm planning to stay at a Marriott in Korea for six days and would like to make use of the LNF guarantee. However, I'm a bit confused. Can I use the guarantee with an Advance Purchase rate? It's prepay in full and non-refundable if cancelled more than 1 day after booking. It's in Korean Won, so presumably, it'd be best to have a site quoting in KRW. I know I can't use a pre-paid voucher. However, there is one established online agency, which is slightly cheaper in pounds sterling. I'm not sure if there's a qualifying online Korean company.

The main stumbling block is that it's an advance purchase rate. Does it qualify for the scheme? If I email the comparison straightaway, presumably I'd be left with time to cancel the booking; if it failed the terms of the LNF guarantee. Also, I can reserve with a pre-paid voucher agency for about £70 more than if the LNF guarantee qualified. I'd get no rewards points though.

Thanks.