Yes I've used them in the past. Small seed is covered in an inert coating [not peat] to make them easier to handle.
But I tend to mix fine seed with sand so that when they are sown they are spread through the sand.

Sorry to disagree, Sbg, but peat pellets are small--though not seed-sized--discs of peat that expand when moistened into cylinders of peat suitable for starting seeds or small cuttings, like peat pots.
Steve, they are also available made out of coconut fiber. The only problem that I have had using them is peeling the plastic webbing that holds them in shape off before planting the seedlings into the ground. Just cutting vertical slits in the webbing suffices for things like pansies or lobelia, but may not be enough for things with woody structure, such as tomatoes or peppers.

Yes I mis-understood the question. there was a fad for coated seed and that is what I was thinking of. I haven't been round a gc except to look at plants so have nt picked up on the product.

I always opt for cow pots - it's exactly what it sounds like. No peat. You pop the whole thing in the ground and it becomes fertilizer for your seedlings.

I used a packet of coated lobelia seed with excellent results. There was no need to pot on or thin out seedlings. I just sowed where I wanted them. I also used peat pellets but would not bother with them again as I thought them an expensive alternative to ordinary seed compost.
If you want to plan ahead on seed planting you might find this web site of interest. https://www.instructables.com/id/Homemade-Pelleted-Seeds/

Bathgate do you plant the seeds straight in to the cowpat?

Yes, I need to give my tomatoes and peppers a head start in the house about now. Fill the cow pots with seed starter or compost and sow the seeds directly into the cow pots. By the end of April, the seedlings get planted into the garden. Planting pot and all directly into the garden reduces transplant shock and doesn't disturb the root system. The pot breaks down into fertilizer and seedlings quickly recover.

Hi I also thought that seed pellets were as Sbg thought, particularly used for very fine seed, making them easier to sow, but as Sbg, I mix with dry silver sand, for very small seeds such as Begonia Semperflorens, Derek.

Bathgate I was having an 'elder' moment. I read your answer as cowpats. I had never heard of cow pots but googled them and find they are made from dried cowpats. Very green and a great way to recycle waste from the cows and add fertilizer for you seedlings. We are always learning something new on this website.

Amazing how not even the poop goes to waste -- and its high quality, perfectly balanced slow release fertilizer - not like the synthetic stuff made in a lab.

I always used Cow manure (dung) from the local dairy until it closed. I then used free horse manure from a nearby stables but it was full of weed seeds. We need to keep learning how to bring tried and tested old fashioned methods up to date.

Very true. My Great Grandmother moved here from Poland after WWII. She knew what to do. Her chickens would graze in the garden eating up all the seeds, the weeds, the bugs, the slugs, caterpillars, mice, grubs, aphids, grasshoppers, etc and leave a little poop behind. Then she would eat the chickens. I understand she had the best looking rose garden. I claimed one of her roses when she passed. I still have it.