Hello everyone
The response regarding the handwriting problem has been brilliant, so thank you to everyone that chipped in with advice and ideas.
I phoned up the Hammersmith and Fulham Archives today and on looking at the original, handwriting still very dodgy, the lady told me that she would have said that the first witness was a Daniel Rothwell/Bothwell and the second witness was a Jean Heather. So three cheers for all those of you that said any of those names

. She also said that she had a look around at other marriages and could not see those witnesses again, so in my amatuer interpretation they were not from 'rent-a-witness'. This very helpful lady also said that there were a lot people with the surname of 'Heathers' in that area. Finally, she did say that 'Jean' was a Scottish name. Finally again

she said that on the top of the original she was looking at, regarding the banns Great Grimsby had been crossed through, but she added she didn't know whether this was relevant to where the banns were or not.
Thank you all again

.
Ewan