Spanish site Bladi claims that that is the case. It claims that after the Brexit, Britain has got closer relations with Morocco and a Gibraltar - Morocco tunnel is in the talks. On the other hand, most of the article is taken up by how Spain has already spent 54,9 million euros so far for the studies of a tunnel to Morocco and the situation with the Secegsa, the company created in 1981 by Spain and Morocco to carry out the study.

Personally I think the article is more about motivating the Spanish project than reporting any progress on the English side.

https://www.bladi.es/tunel-gibraltar-reino-unido-espana,10218.html