Back in 1985 British Rail set up a high speed run from Paddington to Plymouth and a journey time of 2 hours 21 minutes was achieved.
https://www.youtube.com/watch?v=R1EK1Md5-mc
Just fast forward to 31 minutes 30 seconds
If you go right back to 1904 a GWR "ocean mail" special ran from Plymouths Millbay docks to Paddington via Bristol in just 3 hours 46 minutes, the same time as taken today by the 0730 Paddington to Penzance service! That cant be right.
It may be hard for some people from outside of Devon and Cornwall to comprehend this but the big economic problem now facing Plymouths economy is not the difference in rail journey times between say 2 hours 59/3 hours 7 minutes or whatever from Paddington to Plymouth but the one hour (2 stops) by rail it takes for the relatively short distance within Devon itself from Exeter to Plymouth which makes Plymouth seem much further away from London than it actually is. I can drive from Plymouth to Tiverton Parkway in an easy 50 minutes!. Taken along with the M5 ending at Exeter and the launch of an air link from Exeter to London City airport on October 27th, and Plymouth losing its airport in 2011, it is now very hard indeed to get investors to look beyond Exeter to Plymouth in these circumstances especially when your located on a narrowing peninsula where all the main quality transport infrastructure converges/terminates at Exeter. That's why the government is subsidising air links now from Newquay to Gatwick.
And this historical problem is now being compounded still further by the massive rail investments taking or about to take place in London and the south east, Great Western and Midland main line electrification, HS2/HS3 etc etc. Spending per head of population in the far south west is way below the that elsewhere. All that's being asked for by Devon and Cornwall generally and Plymouth in particular is their fair share of the national cake, that's all.