London Bus tour? 15 February 2015 at 9:15AM edited 15 February 2015 at 9:19AM in Going out deals

gavcradd

Hi, we (two adults, two children aged 3 and 5) are going to London for two days next week and we want to book an open top bus tour.

What is the cheapest way of doing this and does which bus companies have the most buses? I've seen an online deal with the Original Tour company for £63, or one with Hop on Hop off buses for £49, both do a 24h + 24h free offer. Anyone recommend either of these or someone else?

Not being a London regular, are the offers if you just walk up on the day better or worse than this? Any chance of haggling?

Thanks!

EDIT : I think I've posted this in the wrong forum - I've re-posted in the UK Holidays and Travel forum, feel free to delete this.