Hi Russell,
Apologies for the delay, I just needed to look into this.
Chile – The currency is the Chilean Peso and USD aren’t usually accepted. So its best to either change £ to Chilean Peso in the UK (it may need to be ordered in advance) or if you want to change currency in Chile then take USD to exchange (I’d recommend changing a small amount of £ to Chilean peso in the UK before you go).
Argentina – The currency is the Argentinian Peso. USD are sometimes accepted albeit in very touristy areas. It isn’t currently possible to buy Argentine pesos outside Argentina so I would recommend taking USD to change once you get there as other currencies can be difficult to exchange.
Brazil – The currency is the Brazilian Real and this can be exchanged in the UK so I’d suggest changing some in the UK before going (again it needs to be ordered in advance) otherwise you can exchange money there and most exchanges should accept £’s.
Hope this helps.
Many thanks,
Vickie