What gift to buy for colleague?

A chap I last worked about with 14 years ago has helped me tremendously in securing a new job and setting myself up as a contractor. I would like to buy him a gift to say thank you. The problem is that I have no good ideas and I thought Reddit might have a good idea or two.

I might have been tempted to go for a really good bottle of wine or whiskey, but not sure that's a good idea. He is in his early 40s, British born and bred, of South Asian heritage, but I'm not sure that he drinks.

I am not really keen on any sort of voucher, as that feels a bit like a cop-out. I had thought of a good set of pens, but not sure if that is naff.

Price: upto about £100.

Any suggestions out there, please??!