Updating just to say I have been successful in weaning my son off the breast, it took four days, it was a bit hard and somehow heartbreaking but I am relieved to say he now happily takes 7oz bottles and drains them happily.
Just in case anyone in similar situation reads this post, I didn't do anythin special other than persevering with offering bottles, I didn't try different brands of formula or bottles and on the 4th day he accepted all bottles.
As for solids, I didn't necessariy reduce the amount offered but meals have been mainly veggies and fruit and this more to try sort out his constipation which we've been battling with for a while.
Good luck to anyone embarking on the stressful journey of weaning their baby off the breast, especially if baby hasn't had bottles/formula before.xx