It will most likely be the case, that will be better off selling as much of your stuff in the UK and then buying the same again in Portugal either new or used.
Get a bunch of quotes, before checking how much you could get for any non-essential furniture, giving you a balance!
When I moved quite a while back, we paid way too much on relocation. A lot what we shipped should have been sold and replaced when we arrived in Portugal.
Sell what you can, ship the rest. Of course, there will be junk that you will be emotionally attached to, but then be prepared to pay!
I hope all goes well