Hi there,
now i have never been bankrupt BUT i did live and work out of the country for several years and made the foolish mistake of closing down all my uk accounts before i went. when i returned i had no uk history for several years so i could get nothing, my experian showed very little, and i was a pain.
i too applied to capital one and after sending in ID they accepted me with a £200 limit, after 4 months they increased my limit to £500 which was good (still very little), several months later they still have not increased it any more despite paying it in full every month BUT to my surprise my bank Lloyds upgraded my account to a platinum account (which although it costs £15 a month comes wih lots of great extras including travel insurance which is handy cos i travel a lot), BEST NEWS YET TO COME - they then offered me a credit card with a £6000 limit, and just to see what happened I applied last month for an MBNA card, they did ask for address verification for last 3 years but then accepted me for a £8200 card, so within a few months i seem to be on track.
My experian still shows as very poor BUT i guess with 6 months of history on there with these cards I will soon find that increasing.
I mean for me I use the cards now for day to day and settle most each month, i do leave a small balance so that they make a few quid in interest but it goes to show with dedication you really can quickly build up a rating, Capital one may be expensive and less than generous on limits but without them I am sure I would have no credit now.
Good luck!