Essex is a fairly large county with different area codes for different towns. Examples include 01702 for Southend and 01245 for Chelmsford.
For an exact answer, you will need to search for a specific town within Essex.
01931 is the telephone code for Shap, Westmorland (near Penrith in Cumbria).
01691
UK telephone area code 0161 is Manchester, but 0161 553 is an invalid number block.
UK telephone area code 01954 (or +44 1954 in international format) is Madingley, Willingham, near Cambridge.
A UK telephone number beginning with +44 754 is a mobile.
Clacton - UK Parliament constituency - was created in 2010.
01792 is the area code for Swansea
Until the early 1990's, area code +44 21 (or 021 within the UK) was Birmingham, which is now area code +44 121 (or 0121 within the UK). There has never been an area code +44 217 (or 0217) in the UK.
In the UK, area code 020 is London, but there are no numbers beginning with 020 2. Other countries may have similar telephone area codes.
UK telephone area codes were first assigned in 1958.
00 + 1 + Area code + telephone number.
UK area code 0141 is Glasgow, which has post codes beginning with G.