i reckon they are ufo balloons, i got some off ebay, basically made from a white binbag, a bit of bbq/fire lighter, a bit of wire.
http://www.ufoballoons.co.uk/ scan down to the video.
i set one off on a clear night and it headed off towards manc at quite a pace, you can see them for miles and it was a good 5 mins before it was out of sight, got past astley easily. next one went in the haydock park direction and again was still going when it went out of sight.
theyre quite dear on ebay but once youve seen them its easy to make your own, i paid about £10 for 10 then bought some mig welding wire on a spool for £5 ,a big roll of bin bags and some bbq lighters.
they are an idea copied from thailand & china and look might impressive. my arl fella has a helium bottle and i was gonna launch some balloons with nightsticks in (blue of course)if you tie them in a big line they dance around in formation.
http://www.wishesinthesky.com/?gclid=CLfUuJ_Vj5QCFQ6T1Qody3TLgw
http://www.sourcing4u.co.uk/shop/in...ufo balloons&gclid=CJeIjbPVj5QCFRuD1QodHUsZgQ
i might do a load tonight after the footy if its a clear night, so look for the papers tomorrow.