Firstly thanks for all your input on this thread.
Update done my drop this morning arrived all on time and tipped .
Gave myself plenty of time giving myself 3.5 hours from the Bristol area .
M4 closed due to weekend works so rather than follow some diversion that
May well have got me lost or something just done the good old fashioned way .
Went the way I know , j10 through Bracknell M3 to M25 back up to M4 .put about 20-mins on my time . But the closer I got to Tower of London sat nav started to become temperamental 7.5 ton limit here can’t go there etc etc . So again turned the thing off and reverted to old school went the way I sort of knew .
A4 to Hyde Park Corner
Then follow the road down past Victoria into parliament square then hung a left at Westminster bridge and just followed the river until I came to Tower of London turned right onto lower Thames road , bosh bang on .
Sat nav was sending me south of the river over this bridge back across over that bridge
7.5 t limit etc etc when none were marked ( that I could see anyway ) here’s waiting for next week when my list of infringements come from the various London authorities ha ha ,
Does go to show though sat nav , Google maps & and your own initiative works best
( well I hope so anyway )