Breeze block and beam size query

Hi , looking for advice please.
We intend to open out this door and small window area to create a larger door opening by replacing the concrete lintels with a steal beam - RSJ to hold the joists on the inner leaf and a concrete lintel on the outer leaf. The outer wall has only 3 courses of brick above it where it enters the loft. The inner wall holds 3 floor joists and 3 courses of brick where it also enters the loft.
I'm not sure what size RSJ and concrete lintel to use to cover the new 60 inch opening ?
Is it acceptable to rest the RSJ onto the breeze block ( 1970's )inner wall or is a "pad stone " required?
Thanks in advance

 

152 x 89 steel beam; with 200mm bearing each side on stiff mortar, very unlikely to need a padstone if the loads are as you say.

Your building inspector (if there is one) will, however, see it differently and will demand a padstone, though will not be able to say why

 

Thanks for your reply. I have no objection in fitting padstones, and guess they bridge the cavity sitting on both inner and outer walls?

 

Use a single engineering brick as a pad stone if you must have one.

 

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