Hello and welcome to the forum!
It's great to get a good idea of your options before you need to make the final decision. Obviously all of us here think BLW is the bee's knees

but honestly traditional weaning is not 'wrong' or 'bad' and if it's really important to you to have the support/approval of the people close to you then that might be your simplest option. You can always approach it with the same attitude that BLW-ers apply - that solid food is just supplementing milk at first and that baby gets to decide how much they want to eat.
If, however, you think that BLW is really what you want to be doing, then you need to get your research done and start to educate those around you as well as yourself! It's safe, easy and a really relaxed way to introduce solid foods!
Rosella wrote: 2 of the ladies seem very against BLW - and it will be them I need to support me.
Many of us have had this problem - with our parents and in-laws! It can be the case in many families that the people you really would like to be alongside you show open disapproval of your parenting choices. It's hard, but in the end you are the parent and you are not just plucking ideas out of thin air - you're choosing based on logical reasons and in your family's best interests! I suppose it depends on your personality and confidence how much you want to fight your corner on this. I always tend to think I know best and couldn't care less what the HV thinks...
Rosella wrote:I think as long as I can keep Miles content with BF until he starts taking an interest I will be confident enough but not if he starts to increase feeds and get unsettled.
Hmm, don't mean to worry you, but you'll need to ready yourself for a growth spurt around 6 months. They do tend to want more milk at that age. And to wake in the night (hungry) even if they haven't done so for a while. And many HVs and general acquaintances will tell you this means it's time to start spooning in puree. Actually it's a better idea to give more milk

That's got more calories than anything else you can offer (except mashed potatoes made with butter and double cream I believe!) and will be the quickest way to satisfy hunger.
Rosella wrote:The main aspect which seems conflicted is the issue of iron deficiency in breastmilk after 6mths.
Yes many people think iron is a problem. In actual fact breastmilk can continue to supply
almost enough iron past 6 months, and you only need to
begin to provide it from solid food sources. The iron content of breastmilk is much lower than that of formula... but it is extremely bio-available, meaning your LO gets the benefit of all of it. As long as a tiny amount of solid food is starting to be eaten at around 6 months, iron should not be any problem at all.
A good overview of the BLW philosophy can be found at
http://www.rapleyweaning.com/assets/blwleaflet.pdf and of course the members of the forum can answer any and every question you have (including on the subject of weaning!)