Yeah totally fine but If it's not too late you should use the free E-Packet option and there's a chance you could get hit with VAT at customs, message Fasttech to enquire.
There's a thread on it:
https://www.planetofthevapes.co.uk/...y-on-a-pack-of-coils-from-china.165168/unread
Heavy reading so you might want to skip through to the last few pages after the first.
I used the "express UK Epacket" option, I didn't see a free option other than "Registered air mail"
Is this more likely to get flagged by customs?
and should I contact them to request the free version?
I did read the last few pages of the thread but I'm not sure about the difference, or if I have already done it right