Hi everyone, wow I am honestly overwhelmed with all the responses and feel like I need to dedicate a whole day going through all this advice! Thankyou 😊
There have been some developments...... the major one is that I have swapped my bike and now have a Ridgeback Comet (feel like I need to change my username now!) which has slightly wider tyres, more gears so hills are easier, and the seat has been made higher, although I might try it a bit higher still.
The new seat is very similar to the other one, it's says Vertigo on it.
Your words of encouragement kept me going and it does get easier once you ride a few times as many of you said, also as my legs are getting stronger I'm finding I don't sit so 'heavy' on the seat!
Still not perfect but getting there slowly!