there is no fixed amount that you need a week or a month to support your partner, but coming from appeal cases, some judges have mentioned as a guide the minimum of around a £100wk after you've paid your rent and community charge (basically what you would get claiming basic job seekers allowence - a figure used by the gov for someone to 'survive on') so some judges use that as a minimum guide, as the gov dont give a minimum figure.

but you want your disposible income to look as good as possible, so you will have to mention all the D/Ds on your bank statements and try to make your figure realistic without going over the top making it look like your saving 90% of your wage every month , so why haven't you got £10k in savings