IIRC, old Raleighs used a 92mm front hub, I would imagine other bikes did the same. You might be able to find a good used wheel that fits on eBay.
Depending on the condition of the hubs, you can buy a 27" rim and lace it up to your hub. Worst case is a new hub and rim and have it built if you can't find a vintage wheel.
I'm not to keen on spreading the fork dropouts to fit a modern 100mm front hub. Have a shop do it, or replace the fork with a newer one.
John