How To Say Thank You To A Group?

A thank you letter for their time and help addressed to the whole team would suffice.. Or you could do a gift basket to the office. Both are appropriate.

You could say thank you in different ways by:

a gift basket
a voucher of some sort
or write a letter saying how you appreciate their time and their effort, talking about the whole staffs and people involved.

In most cases like this i would asume, a verbal thank yoand the delete they see on your face is more than enough for them ,that's what they do ,so real emotions and feelings are better than any store bought gift..

Why not make an donation to the drug team i the way of something you know would be useful for other people and the sheer hard work they do