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Check it by Google Map
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http://maps.Google.co.uk/maps?f=d&saddr=london&daddr=hertfordshire&hl=en&geocode=&mra=ls&sll=51.66105,-0.191275&sspn=0.40379,0.884399&ie=UTF8&t=h&z=10
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The county of Hertfordshire adjoins London, so it would depend on which part of Hertfordshire to which part of London and the traffic conditions at the time.
10 miles :)
Hertfordshire is the county just north of London.
Northwest London adjoins the county of Hertfordshire, so it would depend on which part of northwest London and which part of Hertfordshire.
It depends on where in Hertfordshire and where in London. The county of Hertfordshire adjoins London, so theoretically you could just step over the boundary line.
Borehamwood is in the borough of Hertsmere, Hertfordshire (the borough council is based in Borehamwood); but, prior to 1965, it was in London (Greater London) as well as Hertfordshire.
London is further north by 18o of latitude. :)
She is not from london but infact from the hertfordshire area.
she lives in st albans ,hertfordshire, London
Hertfordshire 30miles north of London
You have answered your own question - Hoddesdon is in the county of Hertfordshire in southeast England just north of London.
It depends on where in Hertfordshire you want to travel to, this answer is based around St Albans. There is just under 25 miles between the two taking approx 50 minutes to drive. If you wanted to travel by train it takes on average 27 minutes from St Pancras.