Thank-you for your question.
Regarding the maintenance requirement, in order to be granted leave to remain as a Tier 1 (Post-Study Work) Migrant you must have at least £800 of personal savings which must have been held for a consecutive 90 day period before the date of application. Therefore, if you apply on 20 October 2010, you must be able to demonstrate that you had £800 in your building society account on every day during the preceding 3 months (i.e. from 20 July 2010 to 20 October 2010). On the information that you have provided it would appear that you are able to satisfy the maintenance requirement. However, you must make sure that you evidence this properly. You can rely on funds held in a UK Building Society but must submit your original Building Society pass book with your application as evidence. The Building Society pass book must cover a consecutive 90 day period, ending no more than one calendar month before the date of application. The building society pass book should also clearly show: (i) your name; (ii) the account number; (iii) the financial institution's name and logo; (iv) any transactions during the 90 day period; (v) that there have been enough funds present in the account (the balance must always be at least £800) covering the consecutive 90 day period before the date of application.
Regarding NI numbers, you only need to provide an NI number if (a) you have one; and (b) you know the NI number.
Regarding your previous visa refusals, you do not need to write a letter to the Home Office explaining these. I have checked the PSW application form and in Section D on 'Immigration History" the Home Office is only interested in your immigration history since entering the UK. However, there is also nothing to stop you from submitting an explanatory letter with your application if you wish to do so and feel that this would be hepful.
I hope I have answered all your questions. Please kindly click the green ACCEPT button so that I may be compensated for my time. Thank-you and good luck with your application.
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