i would tend to agree with whoever commented above about using local guys to put quotes / tenders in therefore doing all the donkey work for the F/M - Nationals...
had the same at a call centre ( a massive one thats the name of a fruit..also a colour

) near me .. site survey nica as pie want to give business to lacal people etc,,, written quote blah blah blah.. nowt since even emailed the guy after no reply... made a few enquiries and guess what... yip National...
how about... yeah a written quote will be ££ ..cover the cost of your time travel and producing the quote...deductable from the first invoice should you get the work... call their bluff see if they are genuine..
if they are fill ya boots