Hi this is my first posting here so please be gentle with me. I'm visitng Japan in July and have currency left over from trips to the Czech Republic and Hungary. The hit I have to take to change these back into sterling seems unreasonable, losing something like Ł12.50 per Ł100. Is it worth my while waiting for my trip and will there be any problem exchanging at a Japanese bank? Thanks in advance.

Welcome to FT!

Quick look showed that not all banks in Japan handle exchange from Czech Koruna to Japanese Yen.

If you are arriving at Narita Airport, there are several different banks with currency exchange desk but looks like only two of them handle Czech Koruna; GPA Travel Support and Keio Bank.

Today’s rate at GPA Travel Support for exchanging from Czech Koruna to Japanese Yen is 1 Koruna to 4.13 Yen, where official exchange rate is 1 koruna to 4.916 Yen. You will be losing 16% value exchanging at Narita Airport. This exchange rate includes service fees.

It is possible that a bank has further restriction such as denomination accepted and minimum and maximum on cash exchange. I am guessing that Czech Koruna is not particularly commonly handled currency in Japan, from the fact that not all currency exchange desk at Narita Airport handle Czech Koruna, and not all banks in Japan handle exchange between Czech Koruna and Japanes Yen.

P.S.
You are also looking to exchange Hungarian Forint. Hungarian Forint is similar situation as Czech Koruna, not all Japanese banks handle cash exchange between Hungarian Forint and Japanese Yen.

Frankly, converting cash almost always gets you a terrible exchange rate, but my guess is that you would get a better rate by going to Germany or Austria and changing your koruna and forint to euros (as the exchangers there would have more demand for Czech and Hungarian currency).