Haggis - London
We got our Macsweegans veggie haggis from Waitrose yesterday. They have small veggie ones and small and large meat ones.
I usually dont bother with sauce for it (I dont recall ever getting sauce with back home in Scotland) - just lots of neeps and tatties.
Happy Burns night :)
A Macsween haggis is a safe enough bet I think. They regularly come near the top in tastings and are fairly easy to find. Waitrose carry them.
As for a sauce I would go for a thinnish dark meat gravy/jus. From a packet (!!!) Cross & Blackwell produce a Madeira wine gravy which would be a decent base. Too much sauce would just turn a plate of haggis, mash and neeps into a mess, however. I personally don't care for the dram of whisky which some people pour over haggis. Best kept for drinking.