hi there
i must agree with others, they should at least have a spec for the job, is this a public sector or private sector job.
one thing that does spring to mind if they havent got any info, is that they are just ticking boxes.
on a contract of that size, i woyuld want a site visit, along with a sit down meeting with the descision maker, you need to arm yourself with as muvh information as possible.
Tupe i expect will play a part in this contract, so i would be looking to acquire those detals prior to submitting, you need to find out how many staff they have in site at the present time, and how the contract currently runs.
regards
martin