Thanks for the great ideas everyone, I especially love the idea of heading to the
Disney store on Oxford Street early one morning..
Here's my rough draft of our 4 days:
Monday
We need to drop our hire car back to Paddington Station by 9am so we will drive there and after all the paperwork we will catch the tube into the city.
Have a look around Trafalgar Square etc
Hop on Hop off bus tour, the original tour company looks ok and has a couple of routes available on its 24 hour ticket. The yellow route apparently takes 2 hours 15, but I guess maybe a bit longer traffic dependent.
Lunch
Stroll over to Harrods maybe via Whitehall, St James Park, Buckingham Palace etc.
Have a good explore through Harrods, buy some Christmas decorations (I try to get a dated on every time I'm there), look out for the unique Disney things as recommended by lolainkent
Pick up some dinner at the Harrods food hall and mosey on home.
Tuesday
Catch tube to Marble Arch and meet up with the HOHO bus again - catch the red route to the Shard (this is dependent on our tickets still being valid within 24 hours but we do prefer to hit the road earlier than later)
Go up the Shard (mid morning)
Walk over to the Tower of London
Have lunch and take a tour through (we have seen those hilarious videos of the Beefeaters giving tours and would love to follow along!)
Catch the no 15 bus back to near Leicester Square, apparently this route often has the heritage buses running on it
Pop into M&Ms world, I know this is essentially just a shop but we love M&Ms and can't get all the fancy colours over here, I want a bag of lime green and purple ones!
Visit Hamleys toy shop. I'm sure there must be a cafe here for dinner if time is getting on.
Catch the tube home.
Wednesday
This is going to be a bit of a rest day
Walk to Notting Hill, explore the shops and get some morning tea from the Hummingbird Bakery.
Go to the Diana Memorial Playground in Kensington Gardens, maybe walk by Kensington Palace and the Peter Pan statue dependent on how we are feeling. I also want to have a look at the facade and back of some "fake houses" on Leinster Gardens just north of Kensington Gardens. They were built to disguise an opening over the tube line where the trains used to vent steam or something. A strange thing to want to see but I keep seeing things pop up about them and find it interesting!
Catch a bus home for a lazy afternoon and opportunity to catch up on washing etc
Thursday
Has anyone been to Platform 9 3/4 at Kings Cross station? I gather its a small shop and you can get your picture taken pushing Harry Potter's trolley "through" the wall. DD is just getting into Harry Potter and I think this experience would encourage her enthusiasm even more. My only reservation is that Kings Cross is a bit out of the way just to do this, we are leaving on the Eurostar from St Pancras the next morning but I don't think we'd have time to squash it in then, plus we'd have all our luggage with us.
If we did go, the plan would be to catch the tube to Kings Cross, then back to Oxford Circus. Then we could explore Oxford Street, I want to go to Selfridges particularly as I enjoyed the Mr Selfridge TV series. We could also visit the Disney store and whatever else takes our fancy.
From there we'd go home, meet my parents who I'll get to come up from Southampton so we can say goodbye before heading off to
Disneyland.
We'll then go for afternoon tea mid afternoon at Fortnum and Mason. I know there's a few places you can do afternoon tea but Fortnum and Mason is the one I've always wanted to go to

I thought of then doing the London Eye in the evening, it's a hard one knowing whether to book it or not, I think we'd still go even if the weather was a bit dicey, particularly in the evening with all the city lights it'd still be an experience.
The two other things I'l like to fit in but can't find the space for are covent garden and the Natural History Museum. The museum isn't far from Harrods so depending on how much time we have on Monday afternoon we could pop in for an hour or so. DS loves dinosaurs so seeing the big skeleton would be fabulous, and just the architecture of the building is beautiful inside from the pictures I've seen.
It's hard to strike a balance between not packing in too much to our plans, but still seeing enough of the unique London sights to make our trip worthwhile! Any suggestions?