What a lovely post sashh :)
OP, disclaimer, I don't live in the Uk so can't give you a local perspective but just wanted to share some thoughts.
When we had DS, I was feeling more anti-vaccines than pro, and because I work in the health care field, DH always said that he was leaving the decisions up to me because I was better informed. (I have to say I didn't feel very happy about that because if anything ever went wrong I'd have been to blame for whatever decision was taken [eek].)
I was very nervous about all the combined vaccines, and the vaccine schedule in this country. I felt that what was routinely given was too many vaccines, too frequently, and at too young an age.
Due to some extraordinary pressure by my GP at what was a vulnerable time for me, I had DS given the 5-in-1 vaccine (DPT, HIb and Hep B), and the meningococcal and pneumococcal vaccine at 6 months. I really felt very pressured and like my hand had been forced at the time.
After that, I managed to avoid the issue with the GP for a while and then decided to have a consultation with a different doctor who specialized in alternate vaccine schedules. She went though each possible vaccine with me, their purpose, potential side effects, morbidity and mortality rates from both vaccines and disease, and really helped me clarify what I wanted and didn't want. In the end, we started with an alternate vaccine schedule when DS was just past 3 years old and will be completing it this year. Mostly we've done separate jabs, unless those were simply not available. It's been time consuming, but very worth it as far as I'm concerned.
If you have the opportunity to have such a consult, I'd really recommend it. It may lay some of your concerns to rest. Or it may not. If you and DH still find yourselves in opposite sides of a line, I wonder if you could negotiate. Along the lines of "If I agree to his vaccine, do you agree that this one could safely be left out?"
I don't know if this was helpful to you at all, I hope so. Ignore if not.