Hi,

The variations in quoted birthplaces makes sense to me.
I've known of Longhope as a placename since my youth in the 70s, yet was only a few years ago via this hobby & this website that I learnt of a smaller village nearby called Taynton. It seems logical that some census officials would maybe write "Longhope" if told someone was from "Taynton, near Longhope", for example. Similarly seems reasonable for a census official in Lydbrook to write Mitcheldean instead of, say, Longhope.

LDS aka FamilySearch website has this Baptism which looks a possible fit; admittedly a subtly different surname but worth considering, I'm told FamilySearch are renowned for transcription errors, and sometimes church ministers mishear ?.

Name George Robertson
Gender Male
Christening Date 21 May 1826
Christening Place TAYNTON,GLOUCESTER,ENGLAND
Father's Name Thomas Robertson
Mother's Name Amy

https://familysearch.org/search/record/results?count=20&query=%2Bgivenname%3Ageorge...

HOWEVER, I now see (via Ancestry) that the original Parish Record for this Baptism does clearly state ROBERTSON, but the only George ROBERTson of this age/birthplace I can find living locally in 1841 & 1851 is in Gloucester with parents Samuel & Elizabeth, so maybe this IS our George's baptism record with an incorrect surname ?

My quick look on Ancestry and FamilySearch haven't found our George Robinson in 1841 either, just the later Census', but I'll keep looking. Disappointingly, my newfound access to the FindMyPast site isn't helping me at all, but that's probably me !

Back to FamilySearch, this time searching for Thomas & Amy in Taynton around 1825, gives this record which looks like a sister to George. Researching her may help build the full picture for George.

Name Selina Robertson
Gender Female
Christening Date 17 Aug 1823
Christening Place TAYNTON,GLOUCESTER,ENGLAND
Father's Name Thomas Robertson
Mother's Name Amy

FoD PRs have the full transcriptions for both these siblings;

Record_ID: 154934
Entry_Number: 148
Year: 1823
Month: Aug
Day: 17
Parents_Surname: ROBERTSON
Child_Forenames: Selina
Fathers_Forenames: Thomas
Mothers_Forenames: Amy
Mothers_Surname:
Residence: Aston Ingham Herefordshire
Occupation: Labourer
Officiating_Minister: W[illia]m Bushell
Event: Baptism
Memoranda:
Notes:
Register_Reference: P326 IN 1/5
Page_Number: 19
Parish_Chapel: Taynton
Soundex: R163

Record_ID: 154975
Entry_Number: 195
Year: 1826
Month: May
Day: 21
Parents_Surname: ROBERTSON
Child_Forenames: George
Fathers_Forenames: Thomas
Mothers_Forenames: Amy
Mothers_Surname:
Residence: Tainton
Occupation: Labourer
Officiating_Minister: W[illia]m Bushell
Event: Baptism
Memoranda:
Notes:
Register_Reference: P326 IN 1/5
Page_Number: 25
Parish_Chapel: Taynton
Soundex: R163

I've searched for a Marriage for Thomas & Amy Robinson, and Robertson, within the FoD site PRs, and also on Ancestry and FamilySearch, sadly wothout success. Ditto the 1841 & 1851 Census.

?????

Re the Robinson OR Robertson name question, I think it worth noting that I cannot find ANY Marriage Records for a Selina ROBERTSON on FreeBMD site in Gloucestershire or Herefordshire, yet there are some for Selina ROBINSONs. Similarly there are far more marriage records for George ROBINSONs compared to just a few for Robertson, who seem far less numerous in our area.

This one seems a good fit for our Selina born 1827, note father Thos and witness Hannah Robinson, who MAY be her sister-in-law, George married Hannah Drew in 1856.

Record_ID: 37356
Entry_Number: 337
Year: 1860
Month: Dec
Day: 30
Grooms_Surname: PRICE
Grooms_Forenames: William
Grooms_Age: 30
Groom_Condition: Bachelor
Grooms_Occupation: Collier
Grooms_Residence: East Dean
Grooms_Fathers_Surname: Price
Grooms_Fathers_Forenames: John
Grooms_Fathers_Occupation: Labourer
Brides_Surname: ROBINSON
Brides_Forenames: Selina
Brides_Age: 37
Brides_Condition: Spinster
Brides_Occupation:
Brides_Residence: East Dean
Brides_Fathers_Surname: Robinson
Brides_Fathers_Forenames: Tho[ma]s
Brides_Fathers_Occupation: Labourer
Licence_or_Banns: Banns
Date_of_Banns:
Signature_or_Mark: Both mark
Witness_1: Thomas Meredith
Witness_2: Mark of Hannah Robinson
Other_Witnesses:
Officiating_Minister: Tho[ma]s Gosselin Smythies
Event: Marriage
Memoranda:
Notes:
Register_Reference: P85/1 IN 1/4
Page_Number: 169
Parish_Chapel: Cinderford St John
Soundex_Groom: P620
Soundex_Bride: R152

Their 1861 & 1881 Census records in Drybrook (so near Mitcheldean etc) gives this Selina's birthplace in abt 1825 as Aston Ingham & Longhope respectively, as per the above Baptism Record.

????

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Ancestry has one public family tree for the same George Robinson that you're researching, is it your tree ?. This apears thoroughly detailed/researched, but also doesn't have his 1841 Census details, nor his Baptism or parents' names. It shows him in Lydbrook in all the Census' from 1851 thro to 1891. However in 1892 his wife Hannah dies, in 1901 Census he's in Leigh, Lancashire with his married daughter Marina Key, it doesnt give his death date. Obviously I'm not saying to rely totally on any public tree, errors do occur, but it may be helpful.
http://trees.ancestry.co.uk/tree/48900887/family?cfpid=28115703584