Ann: Investor Presentation, page-5

In the interests of offering a slightly different point of view, I would say that a P/E ratio in the 30's for a business that is not able to offer an outlook at this stage due to their concerns for the future around the BREXIT consequences makes the SP a little high still. That little BREXIT exercise is almost certainly going to end in tears for anyone close to it. Against that they've performed well over time and their directors have increased their shareholding from 2017 to 2018 so they must think everything's going to be fine in the long term. I suspect the next year or so will be more difficult.
I've owned them in the past and did OK with them but sold out at $ 4.70 a few years back so I'm a long way from being an expert but there's a few of these guys that have started out fast and slowed down (GTK, HSN, ADA, IRI).
I do think GTK is one of the better ones but their next half year update needs to be pretty reasonable or else.