Front Mount Baby Seat Advice

Hi All!

I am done reading up about the various options and I feel like I am more confused than I was when I started. I got my bike second hand on fb marketplace. Its a Ridgeback Meteor Ladies Bike. I have added pictures of the bike, the handle bars and the stem etc. I need to buy a front mount baby seat asap! Will the Thule Yepp varieties fit this stem? Will I need some sort of an adapter? Are those available now in the UK? Is a WeeRide Deluxe what I need to get instead? Any specific tools I need to install it? Will my knees/chest hit the sit when I ride? I am open to any other options that someone’s tried and think its better.
Baby is going to be 1 year old in 2 weeks.
She is 29 inches.
Weight is 11.24 kgs
I am 5 feet 7 inches
Bike is:
Ridgeback Meteor Ladies Bike –
24 speed/ 3×8 gears
21 inch medium to large frame (slightly lightweight)
28 inch wheels

Please help 🙏🏽