If they refuse your discretionary leave to remain the UKBA usually give you 28 days to leave the country. If you do not they will issue you with removal directions and will force you to leave the UK.
If you were a refugee and the circumstances regarding why you can not return to your home country have not changed then the UKBA will need to address this. If the UKBA decide that you being an Eritrean citizen it is not safe for you to return and you can provide evidence to support this to help the Immigration office make a decision in your favor then they are likely to allow you permission to remain.
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).