The problem with this Jonathan is that there were two Jonathan Bartholomews born in the 1850s.  They were first cousins and their births were no more than 10 miles and three years apart .  This led to my getting the two thoroughly confused.

This one was a stable lad rising to the dizzy height of head lad.  His cousin died at the age of thirty and was omitted from all the censuses save his first in 1861, dying in 1886.  This Jonathan appears in most censuses, married and had a family and died in 1924.  Both their deaths were registered in the Newmarket district.
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His birth registration:

Surname   First name(s)      District   Vol  Page
Births Jun 1852   (>99%)
Bartholomew Jonathan Mildenhall 4a 457
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He was first found in his father’s census of 1861 but in 1871 he was a stable boy living with a Race horse farrier (blacksmith and running a rather superior lodgings for 19 stable boys at The Cottage, High Street, Newmarket; his birth was reported as at ‘kennet, Suffolk and he was 19.

He married in 1877 whereas his cousin did not marry and his family of two children appears clearly in the 1881 census:

Surname Forename Age Relation Occupation Birth Place

Bartholomew Jonathan 28 Head Marr  Head Stableman  Kentford, Suffolk
Bartholomew Anna M 24 Wife Marr  Dress Maker  Kentford, Suffolk
Bartholomew Bertram 3 Son Scholar  Kentford, Suffolk
Bartholomew Bessie M 2 Daughter Kentford, Suffolk
Wake Mary 62 Mother In Law Widow  Monthly Nurse Wickhambrook, Suffolk
Turner Emily M   2 Nurse Child Newmarket, Suffolk

Ref: RG11/1845/F?

Address: Main Street
Parish: Kentford
Registration District: Mildenhall
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In 1891 neither Jonathan nor his wife Anna are to be found but Bertram clearly is, with his grandmother (or step-grandmother?):

Surname Forename Age Relation Occupation Birth Place

Wake Mary 69 Head Wickham Brook, Suffolk
Wake Robert 40 Step Son Gardener Domestic  Kennett, Cambridgeshire
Wake Sarah 28 Step Daur Westley, Cambridgeshire
Bartholomew Bortram 18 Visitor Kentford, Suffolk
Bartholomew Percy I 8 Visitor Kentford, Suffolk

Ref: RG12/1452/F?

Address: Bury Road
Registration District: Worlington
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But in 1901, Jonathan and Anna were to be seen once more:

Surname Forename Age Relation Occupation Birth Place

Bartholomew Jonshan 50 Head Head Groom Man In Racing Stables  Kentford, Suffolk
Bartholomew Annie M 44 Wife Kentford, Suffolk
Bartholomew Percy J 18 Son   Assistant In Bootshop Kentford, Suffolk

Ref: G13/1541/~F129

Address: Upper Station Road
Parish: Newmarket All Saints
Registration District: Newmarket
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And the three of them were together still in 1911, though Jonathan was out of work - or retired, or ill.  Percy was a shopkeeper in a Bootshop.  They recorded they had had four children, all of whom were still alive.  Their house was a substantial seven rooms (excluding scullary, landing and bathrooms).  Percy signed the form - but someone else had filled in the main form, I wonder whom?  Though it looks like the original entry was in pencil and then written over in bold, clear ink - by an enumerator?
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And finally, this looks like his real death:

Surname   First name(s)   Age   District   Vol  Page
Deaths Mar 1924   (>99%)
Bartholomew Jonathan 71 Newmarket 3b 689
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In 1911, Bertram was married with a son Francis Percy.
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Their marriage index:

Surname First name(s) District Vol Page
Marriages Sep 1877   (>99%)
Bartholomew Jonathan Mildenhall 4a 749
PAYNE Anna Maria Mildenhall 4a 749
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