rent arrears of a tenannt and reclaiming owed money

Tenancy Types and Management

I have a propert that has been rented since may 7th 2006 to a couple. the first cheque had to be represented a couple of times and they did not pay the first months rent from 1st June. Subsequently the paid every month but were already one month in arrears. (I have one months deposit from them which they wanted me to use!). They then defaulted on October 2006 rent without any notice. This was due to the tennants husband leaving her. (they are both on the tenancy agreement). The tenant agreed to pay in some money on two separate dates but did not do so. I issed a section 8 and 21 against them, this expires tomorrow. This will now mean that they are 3 months in arrears. Obvioulsy I wish to recover the money quickly - she keeps saying she'll pay and doesn't and she also doesn't contact me too which makes it worse. I was wondering what the best thing to do was - Just start proceedings for eviction and at the same time issue a county court claim against them both to recover the monies owed? I do not have a rent book only that they pay me directly into my bank account so I have statements. Should I send them a letter first stating that if the money is not paid by a certain date then that is what I will do? I have read the HMCS website and they say use reasonable behaviour as you will have to show this in court. Which would be the best approach? If I just do the eviction how can I pursue my money fromn them? Is there a correct procedure I should follow?

Many thanks
Ellen