We were invited to DH's co-worker's buffet, but not her ceremony. I didn't mind, honestly, because obviously DH only knows her from work and I didn't know her at all. I thought it was a nice gesture to invite the co-workers at all, but I'm glad we didn't have to go to the ceremony. It's a bit awkward to see someone married when you've never met them before. Also, whilst fruitcake is common, it's also possible to have a sponge wedding cake. We had a very nice Victoria sponge from M&S for our UK reception.