Does anyone know a good (cheap or free) app which can scan printed Chinese characters and provide an immediate English translation? I've seen an excellent, free "English to Chinese" one but nothing that seems to work the other way. Thanks.

Try Global translator. It's free for Andriod and IOS
www.smartappsapk.com/global-translator-apk/

I downloaded Google translate from the Apple Store on my iPhone a couple of months ago. It is not blocked, is free, and works fine.
I assume it is the same for Android.

Google Translate APK is quite powerful.

Here's an alternate download link in case you don't have access to Google Play Store:

apkpure.com/[...]

We use the offline app "Waygo".

Many thanks all. Very helpful.

use baidu fanyi, it can translate photo, objects and many more..