1 Mgps connection to internet

I have just installed a 3 pack Multy X and placed the 2 supporting nodes in what were reported as perfect locations. Whilst the speeds between nodes are very fast, using diagnosis, I only get 1Mg download speed to the host node from the internet. It does have 19Mg upload. Then re-installed , using only the 1 host Multy X and diagnosed again with the same result. Using 2 broadband speed checkers from the internet (which.co.uk and uswitch.co.uk) , the download speed registers over 70Mg. 

I can’t help thinking I’m missing something very obvious, but not able to move forward. Any help appreciated  

#MultyX_May_2019