We know the real-world pressures of project delivery - the tight deadlines, funding hurdles, compliance demands and competitive tenders. That is why we cut through complexity to deliver fast, reliable surety solutions that keep projects moving.
Darren Guymer
Head of Surety
Get in touchDarren Guymer brings over 15 years of underwriting expertise in the UK surety market, having worked across both large corporate environments and agile, entrepreneurial MGAs. This breadth of experience has given him a deep understanding of contract, commercial, and travel surety products, as well as valuable insight into navigating both positive and challenging economic cycles. Darren is recognised for his authentic, straightforward approach and his responsiveness — qualities that have earned him strong, lasting relationships across the industry. He combines a practical mindset with a collaborative spirit, consistently focused on delivering clarity, confidence, and value in a complex niche market.
Our approach blends technical underwriting expertise with commercially minded, straightforward thinking, so our partners get clear answers and decisive support when it matters most. We build lasting partnerships by understanding risk inside out and tackling it with clarity, speed and purpose.
Appetite:
Our Surety Bond Solutions:
Performance Bonds
Retention Bonds
Maintenance Bonds
Highways Act / Street Works Bonds
Supply (offsite materials) Bonds
Advance Payment Bonds
Customs & Excise Bonds
Who We Support:
Brokers
Work with a team that moves quickly, delivering flexible, market-aligned solutions for your clients.
Contractors
Secure the backing you need to tender, mobilise and deliver without unnecessary delays.
Developers
Keep your projects on track with surety solutions that protect performance, payments and programmes.
Employers and Funders
Protect your investments and meet contractual or regulatory requirements with the confidence of a specialist, investment-grade surety provider.
Why Choose Rokstone?
Experience
Led by Darren Guymer, our Head of Surety, with over 15 years in the market and a proven track record across a range of sectors. Darren is dedicated to building long-term relationships, delivering transparent and practical bond solutions that work.
Speed
We know timing matters. That is why we move fast, turning around terms in days, not weeks - so your projects stay on schedule without delay.
Commercially Minded
We get the commercial reality of surety. Our approach balances all parties’ needs, structuring terms that make sense and keep business moving smoothly.
