Speed difference between iPhones and Macbooks

[#1]

Getting a bit of an odd problem, I'm getting approx 35mb/s download speed through the phones and tablets in my house but approx 2mb/s on the two Macbooks (both through WiFi and Ethernet)
Any idea what could be wrong? I was getting similar speeds for all a few days ago but had a massive drop over the weekend. Not made any changes anywhere!
These were taken about 30 seconds apart:

[#2]

If you look at the 'graph' below your mobile download you will see that most of the test your download was low, with a high speed spike at the end.
They don't give you an average, just the highest speed attained (which could be just for one second).
Gary

[#3]

Ah right, thanks. We'll this changes to another moaning about speed thread then!