The signs on Bulk Road at its junction with Catton Road are TSRGD diagram 622.1A (Goods vehicles exceeding the maximum gross weight indicated prohibited), with an "Except loading" plate. This should be tagged as:
maxweightrating:hgv=7.5
maxweightrating:hgv:conditional=none @ delivery

It does not help data consumers to add an incorrect maxweight=* tag, or to conflate exceptions for delivery (loading) and destination (access).

Who, or what, is #OptimoRoute? If this is an organised edit on behalf of a company, there are additional guidelines to follow:
https://wiki.openstreetmap.org/wiki/Organised_Editing/Guidelines