The firm, which specialises in trip to the US, Canada, New Zealand and Australia, is looking to accelerate its growth plans following the cash injection.
The business will continue to be led by Paul Ainsworth and Sharon Mason, who originally founded the business in 1996 but finance director and shareholder Henri Treffers will leave.
The company is based in Manchester and has a turnover of around £16 million.
Ainsworth said: “Over the last twenty years we have built a high quality service offering and established a strong market position particularly in Canada.
“The backing from PHD and its partnership approach will give us an even stronger platform to accelerate our plans and take our business to a new level."
Andy Dodd, partner at PHD Equity, said: “We are investing in a well established travel business, operating in the luxury tailor-made end of the market, and backing a remarkable management team who have created their own niche in Canada.
“We are looking forward to working with Paul and Sharon to meet their growth plans for the business.”