I have updated the spreadsheet to the best of my abilities. https://spreadsheets.google.com/ccc…
The London Pass and Days Out 2 for 1 websites are a nuisance to wade through. The spreadsheet should help you evaluate discounts. I am not a fan of the London Pass, feeling that it is difficult to make it pay for itself. Decide for yourself. Columns show the regular adult price, the price with the London Pass, the price with the Days Out 2 for 1 offer, and the attraction name.
Restaurant and theatre offers follow the attraction listing. A list of absolutely free attractions follows, no London Pass and no Days Out vouchers needed. The final listing is for discounted (not "free") London Pass offers.
Days Out offers discounted lodging. Enter "Superbreak" in their search box and evaluate the offers for yourself.
The spreadsheet shows London offers only. Search the Days Out website for offers from other counties, the results are more manageable than for London.
This spreadsheet may contain errors and omissions.
I encourage you to double check the offer for any restrictions at http://www.daysoutguide.co.uk/ or in the Days Out brochures. Downloading the Days Out vouchers will force you to check for restrictions.
The full list of London Pass attractions is at: www.londonpass.com/attractionsFullList.asp . London Pass "special offer" price reductions that are not free are listed only if they are also Days Out offers. The London Pass is frequently discounted 10% at http://www.visitlondon.com/ .
To take advantage of the Days Out offers you will both need a rail ticket valid on that day. 1 and 7 day paper travelcards purchased at mainline rail stations (not tube stations) meet this requirement. Oyster cards do not qualify. You must also present a Days Out voucher. Vouchers are in Days Out brochures available at train stations or may be downloaded.