For something out of left-field and with a totally different flavour profile from almost anything else you'll find, try Hoxton. It smells like Malibu but is savoury rather than sweet - main botanicals are grapefruit and coconut and it drinks amazingly well. My go-to gin for people who say they don't like gin.
For something classic but with a modern twist, try Masons Dry Yorkshire. Juniper is prevelant and there is a citrus backnote but you'll also get a little aniseed and subtle spice. Refreshing and crisp with a really interesting finish.
For one of the most modern gins out there, try Audemus Pink Peppercorn. It eschews the standard juniper-led style and is full of pink peppercorn with caramel undertones from the vanilla and tonka bean. Utterly sublime.
For something a little more aromatic, pick up Bobby's Schiedam. Smooth as anything and incredibly aromatic, with background notes of orange, clove and cardamom balancing out the juniper.
For something very modern and British, go for Conker. Juniper-led but with some really interesting local Devon botanicals rounding it out - samphire, elderberry and gorse make for an eclectic mix.
Prefer something Scottish? Rock Rose is a great choice. Not very heavy on the juniper and has a crisp, fruity quality, being stuffed with flavours from sea buckthorn, verbena and roman berries, amongst other local botanicals from where the distillery is located.
Speaking of fruity, if that's what you want there's a fantastic British gin with Japanese stylings in the shape of Jinzu. Yuzu and cherry blossom give this a fragrant edge and a wonderful aromatic nose.
All of those can be picked up for between £30 and £45 from Amazon and would make for a great gift for someone who likes their gin.