UK goods available locally
Your best bet in the area is probably Tudor House in Santa Monica, although their markups are rather steep. I've attached a link to a site listing it and other places you can find British food items.
Although it's not in the areas you requested, I've found a very good selection of British goods at reasonable prices at Farm Fresh on Pioneer Blvd. in Artesia's Little India.
re: Chris G.
Actually, Northern Ireland is part of the UK - Southern Ireland isn't, although some would argue it still is (don't want to start a civil war here, though). You could call the Irish Center at 818-238-0445, who would know what shops in the area stock Irish food products. I'd still try the British shops as well, as many British foods are produced in Ireland due to lower production costs there.
re: Chris G.
Nice website. Yes Northern Ireland is part of the UK. Usually, Ireland without a modifier is taken to mean the Republic of Ireland. But, yes it can refer to the whole island - all 32 counties for sticklers out there. Interestingly, all statistics I saw in the Republic were for all 32 counties; one would hardly have known that six counties were using another currency or had another type of administration.
Off the website - here's a place in NOrth Hollywood
Address: 12514 Magnolia Blvd., Valley Village, CA 91607
Tel: (818) 505-9221
The Continental Shop
1619 Wilshire Blvd
Santa Monica, CA 90403-5507
It's basically an overgrown 7-11 filled with nothing but UK food, magazines, & videos. They stock more than Tudor House and at a lower markup, and in the back is a travel agency with dirt-cheap fares to Europe.
Call first to make sure they have what you want.
I've found some products can be hard to find because the multi-national owner goes to great lengths to prohibit import into other markets with domestic production or licence. I recall Knorr was very tough this way for many years.
But you could try some of the following:
Tudor House British Centre
1403-1409 2nd Street, Santa Monica, CA 90401
Ye Olde Kings Head Shoppe
(310) 394-8765 132
Santa Monica Blvd., Santa Monica, CA 90401
Tea & Sympathy
369 E 17th Street, Costa Mesa, CA 92626
(909) 920-9110 908 N Central, Upland, CA 91786
Theodore's Tea Room & Shoppe
(310) 457-9276 29169
Heathercliff Road, #109 Point Durne, Malibu, CA
The Cambridge Cupboard
22456 Ventura Blvd., Woodland Hills, CA 91364
The British Grocer
305 N.Harbor Blvd., Ground floor, Villa Del Sol, Ste. 112, Fullerton, CA 92632
(Great selection of grocery type items)
Hare & The Hounds
2995 E. Thousand Oaks Blvd., Thousand Oaks, CA 91362