The Happy Accountant

The other method of changing the name of a limited company is by written resolution.
This is a resolution passed unanimously by the members (shareholders) of a company.  All the members are then required to sign and date the document.
A Change of Name by Written Resolution form (NC20) is also available for download at the Companies House [...]

There are two ways of changing the name of a limited company, the first of these is by Special Resolution.
This is a resolution that must be passed at a general meeting of the company with a majority of 75%.  An ordinary resolution only requres a 51% majority.
A Change of Name by Special Resolution form (NC19) [...]

It’s always best to chose a good name for your business at the outset , but in case you hadn’t, it is possible to change the name of a limited company after it’s registered.
You must first check to make sure that the new name you have chosen is available.  This can be done online using Comapnies House [...]

The articles of association deal mainly with how the company is run, such as the issue and transfer of shares, capital structure, general meetings, directors, dividends and accounts.
The majority of limited companies adopt a generic form commonly referred to as ‘Table A’. This Table is presented as a series of numbered paragraphs and determines such [...]

Company secretaries do not have specific responsibilities or powers but they may be criminally liable for company defaults (such as late filing of returns and so on).  They are also allowed to sign most of the forms required by Companies House.
A company secretary usually performs the following tasks:

maintains the statutory registers (such as register of members, [...]

Essentially, before you begin, you need:

a company name, which can be almost any name that has not previously been registered.
a Director
a Company Secretary (which cannot be the sole director)
(or you could have two directors, one of whom could also act as Company Secretary)
a shareholder (which can be either the director or secretary)
a memorandum of association
articles [...]