haven't spotted any reference to this stuff (based on searches on 'zambia' and 'haroon rashid aswat')...
a british national was arrested in zambia last week and is being questioned in relation to the 7 july bombs. haroon rashid aswat is alleged to have made more than 20 calls to two of the suspected bombers using a south african mobile phone, and to have visited all four of the presumed bombers in britain (or - in the words of the times, "Intelligence sources told The Times that during his stay in Britain Aswat visited the home towns of all four bombers as well as selecting targets in London."
he is being touted as the 'mastermind' of the bombings, and apparently also questioned in relation to a prospective 'jihadi training camp' in oregon(!)
msnbc says he was detained after a british tip-off, and that he is being/has been questioned by u.s. and british officials, though in other reports it's unclear who is questioning him - eg the times says uk and us "anti-terrorism investigators" are travelling to zambia to speak to him.
it seems he is the person who was claimed to have been arrested in pakistan (though this was then denied): eg
south african mail & guardian said:
Haroon Rashid Aswat was carrying a belt packed with explosives, a British passport and a substantial amount of cash when he was seized, according to intelligence sources in [pakistan].
however, according to the guardian (uk), zambian officials are saying he entered their country from zimbabwe, whilst cnn and south africa's news24.com say he spent two weeks in south africa before entering zambia.
most news sources seem to agree that uk authorities are not keen on answering questions about aswat (eg referring enquiries to zambian officials (bloomberg), that uk high commission are still trying to get access to him (cnn/news24.com), that consular staff are trying to get access to him (times) etc).
guardian
times
bloomberg
news24.com
msnbc story
channel4 news
mail & guardian (s.a.) ('arrested in pakistan' claim story)
anyway, like i said, couldn't see anything up already, thought it was of interest.