A number of points -

For British Resident Citizens,

Visas-
- you can only apply for a 90 day (almost 3 month) Business visa (single or double entry only) unless you have had another visa within the previous 12 months.
- subject to having had (and presumably used) a previous Visa, you can apply for a one year ME Business Visa.
- any visa over 90 days still has a 90 day in 180 visit restriction. That means you can't come back in for another 90 days if you used uo the full first 90 days here.
- you can only apply in UK - unless you have Residency Rights, written specific to you, in the country where you are applying. So no getting a new similar one in, say, Mongolia
- the Visa's validity start/end dates are as you tell the inviting organisation and cannot start more than 45 days (I think it is) in advance of the Visa application/issue date.

Invitations-
-These must come from a resident Russian organisation - agencies get them from about 50Euro.
-as far as an Employers letter, being 'self employed' is an acceptable alternative. Ask the Embassy's Visa handling agents about supporting documentation
Russia Visa Information - UK - All About Your Visa They give advice but do not obtain anything like invitations - you need other agencies. Or just 'borrow' a letterheading from a friend. (I was still using my old Company letterheading 8 years after we closed it down!). The Embassy only check the paperwork looks good, not enquire if it really is.

Other-
- UK citizens do not need health insurance due to NHS reciprocal arrangements

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