I don’t get the costs either. Camden has regular contractors which must mean long-term discounts and kickbacks for huge orders on items such as windows, electrics, lights, but it does not filter down. Send a msg to one or all of your councillors. Link is here: http://www.directory.londoncouncils.gov.uk/directory/camden/ and mention the huge waste of money being spent. Or is it being spent?
To be truthful I haven’t had much luck with them, but in these austere times when spending is being slashed these works, unless completely in an emergency should not even be happening. The more we email, the more of us that say the costs are crazy (compared to Everest for instance to name just one high street store) the more we might be able to move them.
I feel your pain. I was just hit for £2500, but that was for my share of a LIFT!