What kind of wallet are you using? I ask because if you're using a full node (like bitcoin core) then it could be that you need to wait for the latest blocks to finish uploading...or... it could be that the transaction for £80 hasn't had a confirmation yet and we're still waiting for that confirmation before it appears in your mobile wallet.
Using tradeblock (the screenshot) we can see that there's about 1,718 tx still waiting to be confirmed in the queue and that the last block happened 6 minutes ago...I'm guessing that it wasn't in that full Bitfury Block there so it's likely still waiting to be confirmed.
Final edit: Electrum is an spv wallet, likely you're waiting for a confirmation as it should download the block headers pretty much instantly.
Do this...close Electrum...then reopen it..I don't expect your balance to update but maybe it will (if there's some sort of bug or network timeout issue happening)...from there...give it about another 30 or so mins for it to be included in the next block...this happens because sometimes bitcoin ATMs send non-standard trx and the fee is low (compared to free market). I believe the recommended fee is approximately 10 satoshis per byte and we see the average fee is about 14 in the pic above. Taking my comments into consideration - don't worry about the coin being lost it should still hit your address balance. The worst case scenario is this: in 72 hours if the coin fails to route then the ATMs wallet gets the coin back - you would be able to reference the failed transaction with the atm operator to get your money back or request them to send the coin with a higher fee so it confirms faster.