Originally Posted by
carrotjuice
Technically, any. But in practice, Singapore stores are most familiar with the arrangement. London too.
And if you do that in a city that SQ doesn’t fly to, don’t be too surprised if the store is unaware of what to do.
I just went on Penhaligon's website, and most of their stores are in the UK. None in my hometown of San Francisco (or US for that matter). Do those vouchers have an expiration date?