But are you talking about...
... LIONHEART: The band with Dennis Stratton (Iron Maiden, Praying Mantis) on it that released just one album?
... or LIONSHEART: The band with Steve Grimmett from Grim Reaper on vocals?
If LIONHEART: An underrated and quite unknown band nowadays but "Hot tonight" is an amazing record in my opinion. When guitar are heavy enough they sound like second or third NWOBHM generation. However, the essence of the album is hard AOR more or less like masterpiece Shy´s "Excess all areas" (though not so overwhelming and not so high pitched vocals)
If LIONSHEART: Mmm... I don´t consider they´re heavy influenced by NWOBHM. Maybe a little bit but overall they´re a classic british hard rock act in the vein of Whitesnake. It´s a good bad, specially their first two records, "Lionsheart" and "Pride in the act" with an excellent singer.