Apple maps after IOS update

Hi,

Since updating to IOS 11, when I go in to Blind Square select a place then plan a route and choose Apple Maps as my default map service, after tapping go in maps I no longer receive spoken turn by turn directions. Neither do I get haptic feedback on my Apple Watch series 3.
I've been in to map settings on the iPhone and checked that spoken feedback is turned on to the max. If I go in to Maps and select a route without using Blind Square then the spoken directions are working fine.
If I choose Google maps from Blind Square, that map application's spoken turn by turn direction feedback works fine.
I'm running IOS11.02 on an iPhone7 128GB.

Has anyone else come across this problem?
Many thanks in advance for any help or feedback offered.

Warm regards

Graham