Is the place near entrance to Greys multi story carpark still there?
p.s. just checked google streetview, may 2017 and Planet Blue, Brace street was still there.
We used to use them some years back as we fill undercarriage legs with high pressure air, they tested and filled our bottles, they where a PITA to contact, but my old boss used to take his kids into school in Bedford so he would pop in there. Not been there for at least 5 years now.