Yes there are quite a few problems.
Roads policies are going through a review and similar practices to those used for rail are being adopted for the Strategic Road Network.
There is a problem. The cost of delivery of future projects on the railways is looking too expensive in some cases vs the returns on road investment. Add to that the under investment in principle roads, growth in traffic (high than that for rail), new technologies, new policies, and changes in usage all within the context of finite funding. Rail accounts for 8% of the estimated trips made each year in the UK; it has been stuck at that level for about a decade (though the sources may use different methodologies) and it may start to decrease with the continued growth in car usage, significant double-figure growth in local commercial distribution, and a trend in declining patronage of rail.
It wont happen for CP6, but changes in priorities are likely to come in the CP7/CP8 time-frame.