Mr Abbott highlighted his commitment to Sizewell C shortly after his election to Parliament in July.

In a speech to the House of Commons last month, he said: “Over the coming years, thousands of jobs will be created in new nuclear [power] at Sizewell.

“I want kids growing up in Ipswich or people looking to retrain and upskill to get those secure, well-paid jobs. I want local businesses to benefit from the billions of pounds that are going to be growing out of these projects.”

Before becoming an MP, Mr Abbott also worked for a Suffolk-based creative agency that supported EDF on its proposals for Sizewell C, according to LinkedIn.

A Labour spokesman said: “The donation was to sponsor an event. It has been declared transparently and in line with the rules.”

An EDF spokesman added: “Before the election, EDF agreed to support an event with Suffolk businesses hosted by the Labour candidate for Ipswich. 

“The sponsorship money was paid directly to local suppliers and not to the Labour Party or its candidate. EDF, like many organisations, supports business and community events across the UK with politicians of all parties.”

The Labour Government has already pledged to support Sizewell C as part of its clean energy plans. However, the project remains subject to fierce opposition.

A final investment decision on Sizewell C has yet to be made despite around £2.5bn already being spent on the project. The Government had expected to secure backing from private investors by the end of the year, although negotiations are at risk of running into 2025.