"Thanks again to you for your regular communication - and for following up with a text when you realised that I must not have received the emails,  for the efficient and hardworking team that you sent, to Janine for following up, for all being so pleasant and helpful to deal with and for getting the job done in the time frame you specified - I suppose the one shame is that you only do roofing, we'd be happy to meet builders like your team!  I have already passed your name on to a local lady who was interested to know who we had used."