I know, you guessed it straight away
This happens to be the first one we have seen this year
It soon slithered away from it's sunny spot partly hidden in long grass. Extremely difficult to see initially. Thankfully we had William the lurcher on a lead at the time, but this is why - on warm sunny days from this time of year and throughout the summer months, it is always better to be cautious. William tends to back off if he sees them these days, but when he was a puppy he did get bitten by one. Fortunately we got him to the vet quickly and he was on liquids and anti-venom within the hour of his encounter. Phew...