Contractor Required to Install a Temporary Dry Riser Main ASAP

[Messy]

I know this is not portable firefighting, but here goes:

A client is looking for a reliable dry riser engineering company to commission a number of temporary dry riser installations on a construction site in central London. As usual it all has to be done yesterday (if not before)!

So has anyone first hand experience of a dry riser engineering companies? - as I always prefer a referral

They need to be able to design, install, commission (including an acceptance test) and decommission 

Thanks