--snip--
Say what? The feed on sending BTC is $15 right now, so your 10 quid isn't even enough to cover fee's to spend it, say you had $20 USD, then could send a friend $5
--snip--
bitcoin-cli estimatesmartfee 6 ECONOMICAL
{
"feerate": 0.00002737,
"blocks": 6
}
that's the fee in BTC/kB... So, with a 3 sat/vbyte fee you should have a decent chance of getting in on of the ~6 next blocks...
A one input, one output tx from a segwit wallet has a size of ~140 vbytes, so a fee of 420-500 sat's should be sufficient if you spend your unspent output all at once... That's 18 cents...