Got some things in the post to try today. Sizing intel:
The Gathered Cotton Slub Half Sleeve Tee and the Garment Dyed Boat Neck Tee in XL are both perfect on busty figure high street (M&S, Seasalt) size 18.
They are both very good quality. I'm keeping them - rather to my surprise because they needed to be really good at that price for tshirts. They're quite short on me, but just right with high waisted trousers. I hope they don't get shorter in the wash. The gathered slub one in particular I thought a lovely garment. The boat necks more quality basic.
The Boat Neck Garment Dyed Linen Dress in midnight (blue) was underwhelming. Thin linen. Maybe if you can wear orange, that colourway might be more special. Sizing as usual - I almost always have xl dresses and this fitted nicely. There's a lot of fabric in the skirt, so if you have small shoulders and small bust, you may want to size down.
The Lydia Jersey Shift Dress was rather nice and very good quality feel, but just a bit too tight around my widest part and thus unflattering on tummy. Slightly slimmer hips/less mighty bum and this is a great understated stylish summer dress.
The Sail Stripe Fisherman Trousers are not getting much love in the online reviews, but I really like them and they got teenager approval here too. 'Embrace your eccentricity, mother'. The XL was just right on me. This means the sizes are at the larger end of Toast, since some 18/xl trousers don't fit me, so I can see why the online reviews say they're big. Great on curvy figure - space for bottom and then curve in to high waist.