Celebrating Jack

So my lovely husband had a birthday, and we had a tasting menu at Navadhanya. I'm really pleased ghoti_mhic_uait discovered a restaurant which is so well suited to our tastes. We had a bottle of Indian white wine, and I should probably be less surprised that Indian wine exists, but it was merely pleasant rather than exciting. I think in future I will go back to drinking their extremely exciting passion-fruit and chilli lassi.

Then at the weekend we had a birthday party; we seem to be reliably hitting really good house parties these days. Lots of people from different bits of our social group, lots of really good interactions and conversations.

The third part of celebrating jack is that he asked for a spa treat for his birthday. Does anyone have any recommendations at least vaguely local to Cambridge?

I've never really found the idea of a spa appealing so I don't know anything about it. Ideally we want to avoid anything too far in the "woo" direction; we're looking for someone who is going to do nice things to muscles, not chakras or auras or chi or that sort of thing. I don't really want to join in with the massage because I have some mild but annoying trauma around massage, but if it's possible to pay for a couple of hours of hanging out in a nice relaxing environment then I could keep jack company.

The most plausible option I've found so far is The Glassworks. They don't seem to offer the option of just paying for spa time, though. I would be glad to hear if anyone's been there and can tell us personally if it's any good.