is that enough?

[joebloggs]

Surely this figure should be the allowance for a couple which would be about £95 per week

well if you have nothing left of your wages each month, you can hardly support yourself nevermind your wife. so ideally if you could save £240 from your wages every month to support your wife, you shouldn't have any problems, but there is no clear set figure, and of course it also depends on other factors, savings,shares, the case worker, if its a border line refusal they could take your other evidence into consideration. thats why you see some people saying i had no savings and they got a visa, and others saying i had savings and got refused..

a case won on appeal would set a precedent.

i don't think always so, if that was so, then there would be hardly any refusals, i think i saw a figure of 1/3 of appeals is won, and i don't think even then the judge can order the HO to issue a visa, he instructs the HO to look at the app again and not refuse it for the orginal reason, and if a certian amount of time has passed since you applied, the HO can ask for more upto date evidence and could refuse you on that evidence..

From the information I've seen on various websites, it would also appear, if the spouse can demonstrate realistic employment prospects in the UK, her potential salary will be taken into account.

If the financial standing is marginal, and if the applicant has plans to work in the UK, a job offer letter can be included to bolster the application's strength; and failing all other evidence, the applicant may attach a CV (or academic credentials) which demonstrate favorable prospects. Note however, that this is generally the weakest form of evidence.