I believe pressed glass in the UK started in Birmingham in 1831 with the Rice Harris works. I have read a 19th century article which states that pressed glass production probably migrated to the northeast in 1835. The books are silent on my main interest, Manchester glass, but I think the Manchester factories were also producing pressed glass in the 1830s. I have written proof that Molineaux & Webb were making pressed glass in 1843, and pattern designs which I believe go back to 1837 or earlier. I also have a piece of pressed glass which I believe to date to circa 1840 and made by Molineaux Webb.
Early pressings are very rough and if you look at the eBay jug you can see the pattern of raised dots around the rim is very uneven, which led me to think that it is early.
"Peace & Plenty" was a rallying cry for the Anti Corn Law League in the 1840s. There is a pressed glass plate of Corn Law campaigner John Bright with the words "Peace & Plenty" on it. I have strong circumstantial evidence that this was made by Molineaux Webb and would maybe date to circa 1850. I was hoping therefore that this jug might be part of a Corn Law set if you like, but the style of the jug does not look like Manchester to me. More of a northeast style I would say. There's also a large "Peace & Plenty" plate.