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The A6 is Britain's fourth longest road and one of the main historic north-south roads in England. It currently runs for 299 miles from Luton in Bedfordshire to Carlisle in Cumbria, although it formerly started at a junction with the A1 at Barnet.

Running north west from Luton, the road travels through Bedford, bypasses Rushden, Kettering and Market Harborough, continues through Leicester, Loughborough, Derby and Matlock before going through the Peak District to Bakewell, Buxton, Stockport, Manchester, Salford, Pendleton, Irlams o' th' Height, Pendlebury, Swinton, Walkden, Little Hulton, Bolton, Chorley, Preston, Lancaster, Kendal and Penrith before reaching Carlisle.

See Link (Wikipedia) and Link (SABRE) for more information.

The A7 road is 92 miles long and runs from Edinburgh to Carlisle, across Southern Scotland.
Wikipedia: Link

Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.

In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.

In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.

In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)

Read more at Wikipedia Link