I was a bit surprised you were still using horse archers and knights. These units are probably not very useful in the age you're now in. I'd consider deleting them all or upgrading them if that's more your style (I usually prefer to delete because upgrades are expensive). The reason I reccommend this is because usually obsolete units are not worth the upkeep (costs) they require.
I would reccomend building cottages more often rather than farms. If you usually automate workers this may be an issue. Especially with a financial leader like Victoria, and considering the civics you've employed (well chosen by the way), you should build more cottages when you can. People frequently call this a cottage economy (CE). By doing this you'd have substantially increased your income and probably reached the tech level you're at now much earlier. The alternative is to go for a Specialist Economy (SE)where you build farms and usually no cottages at all, and employ specialists to do your research etc. The SE and CE have different pros and cons but in general you should try to stick to one or the other. For your type of gameplay I think CE is best.
As a general rule of thumb, try to avoid settling cities that are 1 tile away from coast. You lose a lot of productivity from the coast tiles then.
In general, your cities are too spread out (on your main land). Plains are not so bad but unused grassland is a terrible shame. Cottaged grassland is very valuable, and even just 2 or 3 tiles of grassland is enough to justify building another city. Think more about your city placement earlier on to try and utilise all the land you have. It's more important to use what you have than worry about cities overlapping. In particular, a lot of grassland around Nottingham has been wasted.
It's also great to see you don't have a case of wonder addiction!
Another tip, since you have the Kremlin, you should use rush buying whenever you can. It's hard to tell but you may have been doing this already, since you do seem to have quite an income. With the Kremlin, rush buying is very powerful and actually more effective than building using hammers.
EDIT Actually for the rush buying strategy, it might go without saying but you should have production multipliers like forges, factories, power plants etc. in the cities you rush in for best effect.