Silverlocks

@Silverlocks if you are in the market for a kilo of silver, then both I and @Leonmarsh have bars listed at £640 ( personally I'd choose Leon's as its ten times cooler looking 😂)

I think the silver forum has come through again with cogent answers to a question, even if in the nature of an informed guess.  Well done all.

They have been cheapest for cast bars a few years now, they probably just have their materials/refining/recycling costs bolted down tight. Its better to make a few thousand £20 profits...rather than a few hundred £50 profits. 

At the end of the day just shop around. For the sake of a piece of paper coa are you going to miss out on a reasonable priced vintage Johnson Mathey bar? Don’t think so!

Baird are usually cheaper as they are also a refinery ( they mint/cast their own bars) whereas other dealers have to source in..that will explain some of the price difference 🤔 

To save everyone having to look at the various prices, and working the respective premiums out for themselves, why not state them in your post, rather than just say "significant"?
What are you interested in buying and owning? A silver bar or a certificate piece of paper?
How much extra does the piece of paper cost?
Is it really worth that much?
😎

As @Petra says, Baird come sealed and do have a coa attached. 
That being said, the coa's from metalor/valacambi etc are in my humble opinion a load of complete trash/nonsense. Anyone ( except me) with half decent computer skills could theoretically print one in 10 mins!
Buy all means do stick to well known brands until you get a feel for things,but don't get caught up in a does/dose not have a COA. 
A block of silver is a block of silver and will always be worth what the price on the day dictates. 
 

Baird bars come in sealed wrapper, what more is needed? Well recognised company.

If I were buying silver bars new I'd go to Baird's. Seem to be consistently cheaper than other brands over the past year or two even with the Vat. Well recognised brand I am surprised they aren't more common on here.
I don't personally care about coa or fancy packaging on cast bullion bars though some buyers might.

I see a couple of UK outfits - notably Bairds and another outfit called Betts which I'd never heard of before selling 500g, 1kg, 100oz and similar size cast silver bars at a significantly smaller premium than the rates fetched by players like Metalor or Valcambi through a dealer.  The catch (?) seems to be that these bars don't come with a certificate of authenticity but just a maker's mark.
This seems like a too-good-to-be-true scenario - does this affect the resale value, am I looking at some sort of apples-to-oranges comparison that I've missed or is there some other reason for the price difference?
Example - https://www.bairdmint.com/products/1kg-silver-cast-bar-jbr vs. 1kg metalor bars from your favourite dealer.
 

A complete set of the 10oz coins would be a sight to behold.  

I haven't removed them from the frame, they still do the job.

Ebay is my preferred supplier.  I've bought just about all of my computer equipment through ebay since about 2001.  If I want to go shopping for something (not just computers) I'll often hunt around on ebay in the first instance, even before looking at regular online vendors like Amazon.
I've spent a lot more on computer equipment than I have on precious metals.  A lot more.
 

@LawrenceChard let me know when you get these in stock please

And the Oscar for best silver meme goes to...

Yale is released on thursday, so there might be some bullions at the same time?

If you're talking about silver, pre-owned items don't attract VAT.  Irrespective of their condition, this is the significant item W.R.T. sales.  You might see something like 'our choice' or 'sellers choice' on a listing, which means that the condition may be less than pristine.  

No panther yet in bullion, first coin was the lion and next is likely to be the yale. 
The bullion began after the RM was probably already tooled up for the proof lion.

In related news, dad joke of the week -
Why are the pyramids in Egypt?
Too big for the British to steal . . .
I'm here 'til Thursday.  Try the fish.

If you're talking about silver, pre-owned items don't attract VAT.  Irrespective of their condition, this is the significant item W.R.T. sales.  You might see something like 'our choice' or 'sellers choice' on a listing, which means that the condition may be less than pristine.