Buoyed by his superb personal best to win the British Milers Club Gold Standard meeting Tom Marshall returns to Watford for the third Grand Prix of the summer tomorrow.

The Wales international won an amazing 1500m at Woodside on June 14 in which the top five broke 3:40 and 11 of the 14 finishers clocked personal bests.

Marshall, who shaved almost two seconds off his best, will be hoping for a similar result tomorrow for his final warm-up before the World Championships trials but stiff opposition will come from Tom Farrell, James McMurray and Josh Carr.

Sean Molloy was another to impress at the Gold Standard meeting, ending a five-year wait to improve his 800m PB, lowering it from 1:48.24, which coincidentally he also ran at Watford as a teenager, to 1:47.76 for 11th fastest in the UK rankings.

That represents a welcome return to form for the former World Junior Championships athlete and with that confidence he is sure to now relish the chance to take on in-form Daniel Rowden in a tasty senior men’s A race.

Rowden set his PB of 1:46.86 when finishing runner-up behind Jake Wightman at the opening Grand Prix meeting at Solihull and as the fastest man in the field the newly-crowned England Under-23 champion will be the one to beat.

A host of other 1:47 athletes this summer will have him in his sights including John Bird, Neil Gurley and Spencer Thomas, while Stephen Knuckley of Australia and Ireland’s Kieran Kelly will add to the competition.

Newly anointed England Under-23 champion Jess Judd, who ran a superb lifetime best of 4:05.20 at the Watford Gold Standard meeting to go third on the UK Rankings, heads the line-up for the 1500m.

Judd is joined by former Olympian Hannah England and Rosie Clarke, the current UK number one 3000m steeplechaser with her 9:37.75 in California last month and who is looking to sharpen up ahead of the trials.

New Zealander Katherine Marshall is the fastest woman in the 800m field on current form with a 2:02 to her name this season while the domestic challenge is headed by Revee Walcott-Nolan and Ellie Baker.

The big name in the women’s 5000 is multi Olympian Jo Pavey, who will be racing the distance for the first time this summer. A year ago Pavey clocked 15:24.74 in Boston and she will hoping for something close to that ahead of the trials.

Up against her will be Jessica Martin (nee Andrews) and Steph Twell, both of whom have run 15:24 this summer.

Tomorrow's meet is due to start at 5pm and admission costs £5.