I feel your pain. Been looking for seemingly ever for a tool that can hand me a brilliant solution on a plate, but among the dozens and dozens of sites I've bookmarked, it doesn't exist as of yet.

You're stuck with making your own choices, but using the 60/30/10 rule (60% of the scheme should be your neutral/ground color, 30% your brand color, 10% your alert/click me color) for websites and apps is still your best bet.

As far as guidance in choosing which colors to use, if you don't have a brand color to start with, page through one of the color swatch galleries (like Color Hunt or Picular or Color and Color or Adobe Color until you find something that matches the project requirements, and once you have that, here are some of the more useful/interesting sites I've found:

MOST PRACTICAL:

Enter your brand color into Colormind or Coolors and lock it in, and the site will generate palettes of compatible colors.

Palx will generate a spectrum of shades and tints sympathetic to your brand color.

Color Designer will generate tints, shades and color harmonies based on a single color, which you can use to build your palette color by color.

USEFUL:

Make Tints and Shades will generate groups of tints and shades based on as many colors as you want.

Eva will use your brand color to generate compatible tint/shade strips for the success, info, warning, and danger colors used in UI kits.

Circle Journey enter your brand color and switch up the Colour Type/Base Colour dropdowns to get color suggestions that are a bit more unusual than standard complement/analogue and so forth.

INTERESTING:

Geenes is a bit more inspirational/fun than practical, but it generates a color strip that varies by hue, saturation, tint and shade and presents it in an app screen mockup. A bit crude at this stage, but pleasing to look at.

Colorbox generates a color strip based on hue, saturation, and lightness. Not targeted at building a site/app scheme, but useful for exploring variations on a color for use in illustration.

AND AS LONG AS I'M DUMPING ALL MY LINKS, HERE ARE TWO ARTICLES WORTH SKIMMING:

11 Tips For Building Great Color Palettes and How To Get A Professional Look With Color

If you don't mind me asking, why didn't you stay in London? Too expensive?

+1

I've been living with it for a few days, and I generally like the "aesthetics" of it, but I'm finding small UI labels slightly harder to read.

If I had the option to bump up the font sizes by 1pt system-wide, that would probably do the trick.

Maybe I should take this as a sign to lower my display resolution?

I don't do much with font creation these days, but I've worked with most font creation software available since the 90s, and the best one I have ever used was probably Fontographer.

In my case, "best" means I had the easiest time setting widths, spacing and kerning tables with it – I've stuck with Adobe Illustrator for drawing the individual letters.

The folks who now own Fontographer have a newer product: Fontlab Studio. I've only played with the trial version a little bit, but it looks pretty good.

The Sketch plugin is promising, but needs more precise control over metrics and a kerning feature. Looking forward to seeing what they do with it, though.