Jan, I did a Champagne and Continental Breakfast last July for my parents 60th Wedding Anniversary, they live in sheltered accomodation. It went brilliantly so good luck.
The Haggis and neeps is a must and maybe you record some bagpipe music for the entry.
How about Tartan Serviettes, maybe choose a colour theme( I did purple lilac and white).
You could get a few  ballons to match the colours in the tartan. The pound shop sell 40 shot glasses. Tea with a shot of Whiskey in mmmmmm. The thing to remember is their age so dont over estimate the food. Ebay is a good source for the ballons and other bits and bobs.
I dont know how far you want to go but could you get hold of some Heather for center pieces? Best tip of all is relax and dont get worked up and ask for help. Gill xxx