Between 1960 and 1961, two sections of (what is now known as) the M20 motorway were built between junctions 5 and 8. This was known as the Maidstone Bypass and was renumbered the A20(M) as it bypassed the stretch of the A20 through Maidstone.
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Britain's first motorway, the Preston by-pass, opened in 1958. Designed by Lancashire County Council under civil engineer Sir James Drake – regarded as the pioneer of the UK motorway network – it's now part of the M6. The next 10 years saw UK's network expand as hundreds of miles of motorway were built.
In later years, as the M1 was extended southwards into London and the M25 was built, the M10's original purpose eroded. It was sometimes suggested that the motorway might have been extended to meet the M25 at junction 22, but this was never proposed.
Answer. Answer: A motorway just relates to the A road that it's relieving pressure from. The reason there is no M7 is that the A7, which runs from Carlisle to Edinburgh has no need for a motorway to relieve it.