http://www.ukvisas.gov.uk/en/ecg/chapter9#point%20three
There is no explicit minimum figure for what represents sufficient maintenance. However, in 2006 UKAIT KA and Others (Pakistan), the AIT strongly suggested that it would not be appropriate to have immigrant families existing on resources that that were less than the Income Support level for a British Family of that size (See Paragraph 8 of the determination - available on the Asylum and Immigration Tribunal website). If it is more likely than not that the total amount that the applicant and sponsor will have to live on will be below what the income support level would be for a British family of that size, then it may be appropriate to refuse the application on maintenance and accommodation grounds.
so roughly the minimum your looking at is £95 left a week for you both after you've deducted money for bills from the income.
this is only a rough guide, i can not tell you if you will be granted a visa, with btw £50-£100 a month left over and £1,200 savings, but some .people have got a visa with no savings and while being on benefits. at least you have a job? and some savings, i hope you will, but with a bit more planning you could have increased your chances
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