Hello Snazzyru, yes you are right, the top picture shows a ladybird larva. The bottom picture shows a ladybird larva at the top ... and the orangey thing below it is a newly formed ladybird pupa (the pupa case darkens eventually to a browny black).
Hope this is of some help.
Most likely they were Harlequin ladybird larvae - not originally being a British species of Ladybird until Harlequin Ladybird visitors from abroad found they liked it here and have thrived. Not unlike numerous homo sapien species which also have come from abroad and stayed (Romans, Vikings, Normans, Huguenots, East Europeans, Roma and, by all accounts soon, Bulgarians and Roumanians). How similar aren't we to our brother and sister creatures?