Just had an amazing afternoon out at Stonehenge!
An added bonus was that when my Fiancee signed me and herself up for a years membership to English Heritage we were given 3 Months extra FREE for paying by Direct Debit! So 15 months for the price of 12 AND signing up around now means the Direct Debit won't be taken out until around July 28th.
I've checked their website and there is no mention of this deal there, so I think it is only available at English Heritage sites.
Adult (age 19 - 59) £42.00
Senior (age 60+) £30.00
Couple (age 19 - 59) £73.00
Couple (age 60+) £49.00
Adult and Senior (1 address) £60.00
Student (under 19 or NUS member) £32.00
Hope this is Helpful to others, especially with Summer (hopefully) on it's way!