Lilt is made using real pineapple and grapefruit apparently.. Now I know FlavourArt Pineapple testes like pineapple juice and Grapefruit taste like the fruit so I'd start there for Lilt.. And maybe a touch of Inawera Grapefruit too.. But only a touch as it's super strong.
Maybe ChefsVapour if you only want a few bottles because they do postage at a couple of quid for up to a fair few bottles.. You'd have to check though..
Or if you fancy trying a few others, FlavourArt UK do 5 10ml bottles for £15 and they throw in a free one.. Or they do samplers at 5 4ml samples for £10 but you get more like 6 or 7ml..
I highly rate FlavourArt for most flavours, they're as safe as possible to vape right now too.