Thanks guys, from the link JohnL gave, I found this info:
Chapter 21 Annex 2 - "Qualified Person" checklist
Provided his/her stay in the UK does not exceed three months, an EEA national is not required to exercise a Treaty right (for example by working). An EEA national who will be in the UK for more than three months will have a right of residence for as long as he/she remains a qualified person (see Regulation 6 of the Regulations) i.e. exercising a Treaty Right in the UK.
Under the Regulations, "qualified person" means a person who is an EEA national and in the UK as any of the following:
21.2.1 Jobseeker
Does the applicant have evidence that the EEA national is seeking employment and has a genuine chance of being engaged?
21.2.2 Worker
Does the applicant have evidence that the EEA national is or will be working in the UK (for example a copy of contract, pay slips etc)?
Important: A worker does not cease to be a qualified person solely because they are temporarily incapable of work as a result of accident or illness or if they are involuntarily unemployed.
21.2.3 Self-employed person
Does the applicant have evidence that the EEA national is, or will be, in the UK as a self-employed person (for example a copy of business accounts or accountant’s letter)?
Important: A self-employed person does not cease to be a qualified person solely because they are temporarily incapable of work as a result of accident or illness or if they are involuntarily unemployed.
21.2.4 Self-sufficent person
Does the applicant have evidence that the EEA national has sufficient resources not to become a burden on the social assistance system during his/her period of residence in the UK?
You can ask those questions which lead you to be satisfied that the EEA national has sufficient means to fund the visit (for example their intended duration, what services they are going to receive and whether from this that they have sufficient funds for their stay). This would need to be done on an individual basis, and you could not refuse someone simply on the grounds that they were not able to provide 3 months’ bank statements. The fact that an EEA national was economically active at the time of application would normally be sufficient to satisfy the resource condition. As an EEA national could decide to exercise some other form of Treaty right once he/she is in the UK it would not be appropriate to refuse on the ground that you were not satisfied that the person would leave the UK after the visit.
21.2.5 Student
Does the applicant have evidence that the EEA national will be studying in the UK (a letter from a college or university confirming that the EEA national is enrolled on a course and its duration? Where an applicant says that their EEA national family member is already in or will be coming to the UK as a student you may ask adequate questions in order to ascertain that there are sufficient resources available to support the EEA national and his/her family members throughout their stay (in other words the duration of the course). However, you should be flexible on this, as some students may intend to live with relatives.
I also saw:
However, it should be noted that the income of both the EEA national and the non-EEA family member can be taken into account when assessing whether they will have enough money to support themselves during their stay in the UK (or if the non-EEA has no declared income, that the income of the EEA national should be able to support both of them).
Therefore, if I can prove that I ve 100pounds left weekly after rent and other bills have been deducted,I guess this should do, that is if the ECO is aware of all these updates.
Do you think my wife should also point these sections out to them should anything go wrong?
Thanks a whole lot guys.