Thanks for the advice and information, fellas. Much appreciated. I knew for sure I'd find what I needed here
As it happens, I'd already been looking at Lodge, but also a brand called Utopia. Turns out Utopia is made in China, so I've scratched that off the list.
Here in the UK, Lodge cookware is expensive and relatively uncommon. A quick search online suggests there are few (if any) used / vintage examples for sale in my area, and even nationally. However, I found one reputable website in the UK selling the 30.5cm / 12" skillet (no ridges) for GBP £38.99, and the silicone handle holder for another £10. Not exactly cheap, but worth it for the use I'll get out of it... and it's well within budget. Some time ago, my parents and I agreed to stop buying expensive Christmas gifts for each other, and set a rough limit of GBP £25. If my Mum and Dad club together, this comes out pretty much spot on
Skillet and handle ordered. Which has a side benefit that my Mum will stop pestering me about what to get me for Christmas
I can wait for the grill pan. I've got by for the last forty-nine-and-a-half years without one, so I'll see if the prices come down on Black Friday or in the New Year sales...