Speed test showing 25Mbps

[Rostron]

Recently my speed tested on iPhone from the router is only around 25Mbps but it has been around 70-74 over the past few years 

my router is in the longe so there is no distance issues. 
even when only one device connected it's still lower than it should be. 

I have done all the Sky recommended tests which do not show any issues. 

can anyone give me advice

[JimM1]

@Rostron Have a look at your service checker then broadband > to expand and see, will show you what sky see's to your connection incase you have a line fault!

https://www.sky.com/servicechecker