Here its genaral rule regarding unmarried partnership:

"Can I bring my unmarried or same sex partner, to the United Kingdom?

Your unmarried or same sex partner, may apply to join you in the United Kingdom as long as you are present and settled in the United Kingdom. Settled means that you are living here lawfully with no time limit on your stay. If you are returning to the United Kingdom to settle, your unmarried or same sex partner, can also apply to join you at the same time. The relationship may be a heterosexual or a same sex relationship, but you must not be related by blood.

How does my unmarried or same sex partner, qualify?

You must both be able to show that:


any previous marriage or civil partnership that either of you were in has permanently broken down;
you have both been living together as if you are married - or in a civil partnership for at least two years;


you both plan to live together permanently; and
you both have enough money to support and adequately accommodate yourselves and any dependants without help from public funds.
You and your partner are aged 18 or over.
Your unmarried or same sex partner, must get entry clearance before they travel to the United Kingdom.

If you have followed the procedures correctly, your unmarried or same sex partner, will be given permission to stay and work in the United Kingdom for two years. Near the end of this time, if you are both still in the relationship and you both plan to live together permanently, your unmarried or same sex partner, can apply to stay here permanently.

In some cases, we can grant settlement entry clearance. This gives your partner permission to settle in the UK permanently as soon as he or she arrives. To get settlement entry clearance, you must:

have been living together as if you were married or in a civil partnership, for at least four years: and
have spent that four years outside the United Kingdom: - and now be returning to the UK to settle here together.

How does my unmarried or same sex partner, apply to stay here permanently?

He or she will need to complete an application form. Applications (except those for asylum and work permits or under European Community law) will not be valid unless they are made on the appropriate application form. You can get details of which form to complete and copies of the forms from this website, or from:

Immigration and Nationality Directorate (IND)
Lunar House
40 Wellesley Road, Croydon
Surrey CR9 2BY"


Note that you would have to apply for a visa from Ireland.There is no such a thing like registration with police,where you can just get granted extension.All subsequent extension are dealt by the Home Office.