Check p155. Shows School Badge as an acceptable badge on left blanking patch, so I’d say wear the School one or purple diamond if no school badge exists.
I would imagine adults are supposed to have the purple diamond over the school one, but obviously, yeah, if they don’t have a school one then purple it is.
I might have to take back what I said in my previous reply. At RIAT I saw a pilot with not any old RAF identity patch, but one that was clearly designed for MTP (MTP background, light tan text) with matching wings and name badge over the other pocket.
That looks like a standard flying suit wings / name patch velcroed onto a blanking plate. This was smaller, MTP with light tan embroidery, and worn over the left pocket.
While on the ling walk in the Netherlands PCS and heat illness was the topic of the week. Because our regulations specify the combat shirt and most cadets end up with the warmer temperate and caused issues with the RA for the event. All of the soldiers and most of the RAF turned up in the barrack shorts which were thinner material, of a looser cut and no zip. We were all told to dress down to one layer. The barrack shirt for the service personnel and t-shirts for the cadets. The Jacket light weight was just to thick and heavy for marching in the warmer weather.
I can see our dress regs changing to allow the barrack shirt to align with HIP policy.
If they are really serious about these sort of things they need to actually start issuing MTP. You can put anything you want in your risk assessment and policy documents, but if people are having to beg, borrow and steal their clothing they will have what they have.
If a policy change makes MTP into PPE then the organisation needs to issue it.
Most of ours have the warm weather version (and mostly the Mk1 with the annoying Velcro in the sleeves), temperate shirts (and trousers) seem hard to come by in the surplus places hereabouts