Shipping United Kingdom Post Office - Restricted & Prohibited goods?

"Carry" means both import and export, but you would have to check the legality of importing spray cans to the UK via sea mail. By the looks of things they refuse to take all areosoles, so you would probably have to have them delivered via private courier. (TNT?)
I recon when they refer to Illegal or harmful items, they are talking about all the nasties like knives, guns, drugs, and all the other things that aren't legal in the country. Really they won't carry anything that is listed in the link above.

Your bet bet to get them into the country would be sending them via private international courier, but it will end up costing you an arm and a leg to get them in.

 

From my time temping at Parcelforce, 'illegal or harmful goods' generally refers to things like drugs (obviously), human remains, knives, guns + ammo in the same parcel etc -- you'd be surprised how many phone calls we got asking if people could import/export those things!)

I've shipped MSC from Japan to the UK by sea mail before and had no problems there, so you should be fine

 

I would figure that sea/surface mail would be fine for such. If aerosols can be ground posted inside the UK, I do not see why they cannot be sent the same way from abroad

 

Good luck with the sea mail shipping, and I'm sure everything will be fine

*facepalm* Working in a call centre really changes your perception of the general public sometimes, it's true... I did have quite a few calls where people wanted to post their cremated relatives to family in Australia etc and couldn't understand why that wasn't appropriate We should be glad that the only bodies we need to worry about shipping are made from resin, right??

 

*UPDATE*

I just came back from Japan trying to import 4 cans of MSC. They were seized at the check in gate as it is now considered illegal to have any flammable spray cans that are toxic in the air. Apparently this is concidered world wide law since 9/11.
So besides wasting 3000 yen on MSC that was destroyed on me, I did find out that places that export them like Hobby Link Japan have an export license that indemnifies the postal system if anything goes wrong.
I wouldn't risk it. If an item is seized by customs, because you didn't declare it and they pick it up, you have to pay them to destroy the item, so it could potentially work out to be a very expensive trip if you are looking to 'save' a couple of dollars.

Just letting you know and I hope it all works out.