There's more than one Signature
Signature has grown quickly in Europe over the last year or so through a series of acquisitions. Each of the new subdivisions is being slowly absorbed into the corporate whole, but at the moment at least they also retain some of the "look and feel" of their previous selves. So, Signature at Heathrow has a different feel to Signature at Luton, and both are profoundly different to, say Signature in Inverness. They seem like a pretty good company (I'm a customer) but if you're going for a job you'd need to be more specific about your proposed location.